CN201943897U - Wind-power electricity-generating equipment with automatic speed-regulating device - Google Patents

Abstract

The utility model discloses a wind power generation device with an automatic speed regulating device, which comprises an impeller, a main shaft, a speed-increasing gear box, an automatic speed regulating device, a generator and a tower; the automatic speed regulating device includes a variable pump, a quantitative motor , a speed measuring unit, a control unit and a fuel tank, the variable pump is composed of a hydraulic pump and an electro-hydraulic proportional variable mechanism; the input shaft of the variable pump is rigidly connected to the output shaft of the speed-up gearbox, and the output of the quantitative motor The shaft is rigidly connected to the main shaft of the generator, and the hydraulic pump and the quantitative motor are connected through a hydraulic circuit; the control unit realizes the closed-loop control of the whole system of the wind turbine through a speed measuring unit and an electro-hydraulic proportional variable mechanism. Through the automatic speed control device, the speed output from the impeller of the wind power generation equipment to the generator can be stably adjusted, and the generator is driven to run at a relatively constant speed, and a current with a constant frequency and consistent with the frequency of the grid can be obtained without the need for a converter device.

Description

A kind of wind power generation equipment with automatic speed regulating device

technical field

The utility model relates to a wind power generation system, in particular to a wind power generation device with an automatic speed regulating device.

Background technique

Wind power generation is the main form of wind energy utilization, and wind turbines are electromechanical equipment that convert wind energy into electrical energy. Since the maximum wind speed fluctuates with time, the conversion of wind energy by wind turbines has an inherent characteristic, that is, each wind speed corresponds to an optimal power receiver speed at which maximum power conversion occurs. The optimal speed depends on the structural parameters and geometric characteristics of the wind turbine power converter. Therefore, the wind turbine is operated with a variable input speed, which in turn has to be adapted as best as possible to the corresponding wind speed. Regardless of whether it is a large-scale wind turbine or a small and medium-sized wind turbine, the electricity generated by the generator will eventually be used by the user. This requires that the current generated by the power generation equipment must be in the form of relatively constant frequency and constant voltage, or use various processing methods to convert the variable current into a constant current to achieve grid-connected or off-grid operation.

In order to solve the instability problem of the voltage generated by the wind turbine, the current main technical solution is to use a speed-increasing gearbox-double-fed generator system and a direct drive-inverter system on the basis of the variable pitch system. The variable pitch speed control system can adjust the torque and power acting on the wind rotor blades by adjusting the windward angle of the blades. The current pitch control function can only be adjusted under certain conditions, but variable wind speeds appear at any time, making the pitch control lag behind the change of wind speed. The overall efficiency of the speed-increasing gearbox-double-fed generator system is not high, the mean time between failures is short, the frequency is unstable, and the normal quality of electricity cannot be guaranteed. Inverter is unavoidable to generate high-order harmonic load and significant reactive power on the power grid, and the cost of the inverter is relatively high, and the volume is too large, which brings certain inconvenience to production, installation and maintenance.

For large-scale wind turbines, they are mainly installed in large-scale wind farms to realize high-power grid-connected power generation; for small and medium-sized wind turbines, their main market target is a single user, and the main purpose is to meet the electricity consumption of a single household or island user demand and provide cheap and clean energy.

At present, the price of wind power generators on the market is relatively expensive, and the structure is complex, especially the cost of the converter is relatively high, which to a certain extent inhibits the development and popularization of wind power generation equipment. Therefore, it is necessary to study a speed regulating device for wind power generation equipment with simple and compact structure, good performance, low cost and automatic speed regulation. Therefore, research and development of a speed control device for wind power generation equipment with high wind energy utilization rate, good system dynamic characteristics, automatic speed regulation, simple structure, small volume and low cost has potential market prospects and development space.

Utility model content

Aiming at the above-mentioned prior art, the utility model provides a wind power generating equipment with an automatic speed regulating device, through which the speed of output from the impeller of the wind power generating equipment to the generator can be stably adjusted, driving the generator at a relatively constant speed Running, without the need to pass through the converter equipment, it can get the current with constant frequency and consistent with the frequency of the power grid. The wind power generation equipment with the automatic speed regulating device of the utility model can not only reduce the components used in the wind power generation equipment, greatly reduce the cost of the whole machine, improve the reliability of the unit, but also have small volume, simple control, good system dynamic performance and good maintainability , wherein the speed regulating device can be used as a speed regulating device for large-scale grid-connected wind power generators, and is also suitable for small and medium-sized power generation equipment, and can better adapt to different wind farms.

In order to solve the above-mentioned technical problems, the technical scheme realized by the wind power generation equipment with automatic speed regulating device of the utility model is: comprising impeller, main shaft, speed-increasing gearbox, automatic speed regulating device, generator and tower; The speed device includes a variable speed pump, a quantitative motor, a speed measuring unit, a control unit and an oil tank. The variable speed pump is composed of a hydraulic pump and an electro-hydraulic proportional variable mechanism; On the main shaft between them, the input shaft of the variable displacement pump is rigidly connected to the output shaft of the speed-increasing gearbox, the output shaft of the quantitative motor is rigidly connected to the main shaft of the generator, and the hydraulic pump and the quantitative motor are connected by hydraulic pressure. The circuit is connected, and the hydraulic circuit is provided with a safety valve and a one-way valve; the control unit realizes the closed-loop control of the whole system of the wind power generating set through the speed measuring unit and the electro-hydraulic proportional variable mechanism.

Compared with the prior art, the beneficial effects of the utility model are:

(1) Because the control unit in the utility model realizes the closed-loop control of the running state of the wind power generation device through the electro-hydraulic proportional variable mechanism of the speed measuring unit and the variable pump, thereby the reliability of the system control and the simplicity of operation can be improved, and the Power stability, the obtained current can be directly connected to the grid or used by users;

(2) The power generation equipment of the utility model can convert the changing wind energy into stable electric energy. No matter it is a large, medium or small wind power generation equipment, a converter is not needed, and the current output from the generator is a relatively stable constant frequency current. Since the variable variable pump 41-quantitative motor 42 is used as the speed-regulating execution unit, its structure is simple and easy to realize automatic control, good dynamic performance, high reliability, and low cost, which can reduce the economic burden of users and give full play to the advantages and benefits of wind power generation , to achieve high-efficiency conversion from primary energy to secondary energy.

(3) The hydraulic components in the utility model can play a buffering role, prolong the average trouble-free period, and prolong the average service life of the wind power generation equipment.

Description of drawings

Fig. 1 is the installation schematic diagram of the wind power generation equipment that the utility model has automatic speed regulating device;

Fig. 2 is the control block diagram that the wind power generation equipment of the present invention realizes automatic speed regulation;

Fig. 3 is a structural schematic diagram of a wind power generation device with an automatic speed regulating device.

In the picture:

1——Impeller 2——Spindle 3——Gear box

40——Automatic speed control device 5——Generator 6——Tower

41——Variable pump 411——Hydraulic pump 412——Electro-hydraulic proportional variable mechanism

42——quantitative motor 43——speed measuring unit 44——control unit

45——safety valve 46——one-way valve 47——oil tank

Detailed ways

The utility model will be further described in detail below in conjunction with specific embodiments.

As shown in Fig. 1, a kind of wind power generation equipment with automatic speed regulating device of the utility model comprises impeller 1, main shaft 2, speed-increasing gear box 3, automatic speed regulating device 40, generator 5 and tower frame 6; The automatic speed regulating device 40 comprises a variable pump 41, a quantitative motor 42, a speed measuring unit 43, a control unit 44 and an oil tank 48. The variable pump 41 is composed of a hydraulic pump 411 and an electro-hydraulic proportional variable mechanism 412. The speed measuring unit 43 is Speed sensor; the automatic speed regulating device 40 is installed on the main shaft 2 between the speed-up gearbox 3 and the generator 5, and the input shaft of the variable displacement pump 41 is rigidly connected to the output shaft of the speed-up gearbox 3 , the output shaft of the quantitative motor 42 is rigidly connected to the main shaft of the generator 5, and the hydraulic pump 411 and the quantitative motor 42 are connected through a hydraulic circuit. In operation, the hydraulic circuit is provided with a safety valve 45 and a one-way valve 46; the control unit 44 realizes the closed-loop control of the whole system of the wind power generating set through the speed measuring unit 43 and the electro-hydraulic proportional variable mechanism 412 . Since the high-pressure working fluid does not need to consider the layout of the delivery pipeline within a short distance, and there is no strict requirement on the position between the variable pump 41 and the quantitative motor 42, only the speed-up gearbox 3 and the variable pump 41, quantitative motor 42 and The coaxial problem between generator 5 axle centers; Therefore also needn't consider the centering problem of speed-increasing gear box 3 output shafts and generator 5 input shafts, then install the wind power generation equipment of the present utility model and can have two kinds of layout schemes, As shown in Figure 1, the automatic speed control device 40 and the original power generation equipment are directly placed in the engine room at the top of the tower 6, so that the delivery pipeline of the high-pressure working fluid can be shortened, and the current is output at the top of the tower 6. Of course, the quantitative motor 42 and the generating equipment can also be moved to the ground by extending the pipeline of the hydraulic circuit, and current can be obtained in the ground working area, which can greatly reduce the structural size and weight of the wind power generating equipment, and reduce the manufacturing cost. While being difficult, the manufacturing cost of the equipment is greatly reduced.

The process of using the above-mentioned wind power generation equipment with automatic speed regulating device to generate electricity is: when the wind power generation equipment is working, the impeller 1 is driven to rotate by the wind load, and the wind energy is converted into the mechanical energy of the rotation of the impeller 1, and the impeller 1 is connected to the speed-increasing gear through the main shaft 2 The box 3 drives the variable pump 41 to work through the speed-increasing gearbox 3, thereby converting mechanical energy into hydraulic energy. The variable pump 41 sends the pressurized working fluid to the quantitative motor 42 through the hydraulic circuit, and the quantitative motor 42 converts the hydraulic energy into Kinetic energy, and drive the generator 5 to generate electricity, convert kinetic energy into electric energy, and realize the final energy conversion, that is, wind energy is converted into electric energy; The output speed is controlled by the control unit 44 to control the corresponding action of the electro-hydraulic proportional variable mechanism 412, adjust the position of the variable plunger of the variable pump 41, and then adjust the output flow of the variable pump 41, so that the hydraulic pump 411 can be stabilized under the action of variable speed wind load The output flow of the fixed motor 42 is driven to run stably at a constant speed, so that the generator 5 runs constantly, thereby obtaining a current with a constant frequency. During the working process of the power generation system, if the pressure in the hydraulic circuit is too high and exceeds the maximum working pressure set by the safety valve 46, the safety valve 46 will automatically overflow to ensure the safety of each device in the hydraulic circuit.

In the utility model, since the control unit 44 realizes the closed-loop control of the whole system of the wind power generating set through the speed measuring unit 43 and the electro-hydraulic proportional variable mechanism 412, the reliability of the system control and the simplicity of operation are improved, and the current stability is improved. The final current can be directly connected to the grid or used by electrical appliances.

It has been verified by simulation that the system of the utility model has good dynamic performance, good speed control effect, simple structure, convenient control, good reliability and interchangeability, and effectively ensures a relatively stable motor speed under the action of variable speed wind load to realize power generation. The machine operates efficiently, and also improves the stability of the current.

Although the utility model has been described above in conjunction with the drawings, the utility model is not limited to the above-mentioned specific embodiments, and the above-mentioned specific embodiments are only illustrative, rather than restrictive. Under the enlightenment of the utility model, many deformations can be made without departing from the purpose of the utility model, and these all belong to the protection of the utility model.

Claims (2)

1. the wind power plant with automatic speed governing device comprises impeller (1), main shaft (2), step-up gear (3), automatic speed governing device (40), generator (5) and pylon (6); It is characterized in that:

Described automatic speed governing device (40) comprises variable displacement pump (41), fixed displacement motor (42), the unit that tests the speed (43), control unit (44) and fuel tank (48), and described variable displacement pump (41) is made of an oil hydraulic pump (411) and an electrohydraulic proportion variable mechanism (412);

Described automatic speed governing device (40) is installed on the main shaft (2) between described step-up gear (3) and the generator (5), the output shaft of the described step-up gear of input shaft rigid joint (3) of described variable displacement pump (41), the main shaft of the output shaft rigid joint generator (5) of described fixed displacement motor (42), connect by oil hydraulic circuit between described oil hydraulic pump (411) and the fixed displacement motor (42), be provided with safety valve (45) and one-way valve (46) in the described oil hydraulic circuit;

Described control unit (44) is realized the closed loop control of wind power generating set machine system by the unit that tests the speed (43) and electrohydraulic proportion variable mechanism (412).

2. according to the described wind power plant with automatic speed governing device of claim 1, it is characterized in that: the described unit that tests the speed (43) is a speed probe.

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