Wind-driven power plant with hydraulic drive

FIELD: power engineering.

SUBSTANCE: wind-driven power plant with a hydraulic drive comprises a wind turbine, a hydraulic pump installed on its shaft, and a hydraulic motor connected with a shaft of a power generator. The hydraulic motor is equipped with a flow limiter. Between the hydraulic pump and the hydraulic motor there is a hydraulic cylinder with hydraulic and pneumatic cavities separated with a piston. The piston is connected with a stop valve on a discharge pipeline of the hydraulic cylinder and is equipped with a weight and/or the pneumatic cavity of the hydraulic cylinder is connected to the pneumatic system. The hydraulic drive is equipped with a hydraulic and pneumatic damper.

EFFECT: invention makes it possible to increase reliability of operation of a wind-driven power plant and to improve quality of generated energy.

2 cl, 2 dwg

 

The invention relates to the field of energy, namely wind power installations, the transfer of energy from the wind turbine to an electrical generator which takes place by means of the hydraulic drive.

Known wind power installation, comprising a wind turbine and directly associated with its shaft generator (see patent RU 42331791, CL IPC F03D 1/04, publ. 20.08.2008). The main disadvantage of the known device is the necessity of using multi-pole generators to produce electricity with the industrial frequency of 50 Hz as the frequency range of the rotation shaft of the wind turbine is in the range 80-150 rpm Such a mechanism have a large mass and dimensions, and have a complex switching equipment, significantly increasing the cost of energoustanovki in General. In addition, the weight of the generator must be centered at the top of the mast of the wind turbine (height of 10-15 m and more)that will require its high static stability and can lead to oscillations of the wind turbine in the low-frequency range with the possible occurrence of resonance phenomena caused by the rotation of the blades of the impeller.

Known wind turbine with hydraulic drive, which is the closest analogue to the claimed invention and includes the maintenance of the wind turbine, mounted on its shaft hydraulic pump and hydraulic motor connected to the shaft of the generator (see patent RU 42862, CL IPC F03D 9/00, publ. 20.12.2004). Hydraulic method for the transmission of energy of rotation of the wind turbine has a smaller weight and dimensions compared to the above method direct transmission, in addition, it allows installation of motor and generator on the ground that simplifies replacement and repair of certain equipment. The frequency of the generated current in the known device is controlled by the electric circuit operating the clutch. However, the use of the electrical control circuit is not reliable enough and leads to unnecessary complication of the switching installation.

Objective of the claimed invention is to remedy these disadvantages and to create a wind energy plant with hydraulic feedback, providing a constant rotational speed regardless of the wind load acting on the impeller wind turbines, and does not require rotation of its blades. The technical result is to increase the reliability of wind power plants and increasing resource of its work. The problem is solved and the technical result is achieved by the fact that the wind turbine with hydraulic drive includes a wind turbine, the us is set out on its shaft, the hydraulic pump and the hydraulic motor, connected with the shaft of an electric generator and hydraulic motor is equipped with a flow limiter, and between the hydraulic pump and the hydraulic actuator is a hydraulic cylinder with hydraulic and pneumatic cavities separated by a piston, which is connected with shutoff valve on the delivery pipe of the hydraulic cylinder. In this case, piston cylinder can be equipped with cargo and/or pneumatic cylinder chamber is connected with a pneumatic system. The hydraulic actuator is preferably equipped with a hydropneumatic damper.

Figure 1 presents the scheme of the proposed facility with a hydraulic actuator in which the piston of the hydraulic cylinder is equipped with a cargo;

figure 2 - installation, in which the pneumatic cylinder chamber is connected with a pneumatic system.

The hydraulic drive of the proposed wind energy plant consists of a hydraulic pump 1, which shaft is connected with the shaft of the impeller of the wind turbine, locking the rotary valve 2, the cylinder 4 with cavities And hydraulic and B - pneumatic, hydro-pneumatic damper 5, pneumomediastinum 6, gas cylinders 7, the flow limiter 8, the motor 9, oils 10 under pressure from the gas pipeline 11 and the drain pipe 12. The loading cylinder 4 can be implemented by setting the load 13 weight 5-10 tons (figure 1) or by connection is through the pneumatic cavity B with total air system (figure 2).

The proposed device operates as follows. At nominal operation wind load performance of the working fluid provided by the hydraulic pump 1, corresponds to the consumable consumption of the motor 9. This hydrostatic pressure in the cavity And the cylinder 4 is balanced by the pressure of gas into the cavity B of the pipe 11. The piston of the hydraulic cylinder 4 is currently in a stable condition without motion.

In the case of increasing wind load flow limiter 8 restricts the flow of fluid to the hydraulic motor 9 and the excess is fed into the cavity And the cylinder 4. The piston and piston rod of the hydraulic cylinder 4 is moved up to an extreme position, blocking the flow area of the shut-off valve 2. The hydraulic pump 1 and the shaft of the wind turbine under these conditions stopped. The other pneumatic cavity B, connected to a gas cylinder 7, accumulates energy gas compression, creating its pressure force equal to the load pressure of the working fluid. The volume of gas in the system is several times higher than the working volume of the fluid cylinder. Several of these volumes (gas cylinders) can provide a counteracting pressure exceeding the pressure of the working fluid by 8 to 10%. In the future, the power of the motor 9 of the working fluid is only due to the volume of the working fluid in the cavity And, under the pressure of the gas in the cavity B.

In case of reduction of wind loads or wind speed accumulator piston and rod of the hydraulic cylinder 4 is again moved to the lower position under the influence of gas pressure, and the volume of the working fluid flows freely to the motor 9. The piston rod of the hydraulic cylinder, moving, opens the valve 2 and restorative the impeller shaft of the wind turbine. The working fluid from the hydraulic motor 9 is in the tank and out through inlet pipe 12 is fed back to the hydraulic pump 1, closing the loop.

The shut-off valve 2 is provided with mechanism for fast switching on and off by means of a spring mounted on the axis of the arm of the crane (in the drawings is shown conventionally). With the rapid closing of the valve 2 may be a major overload on details of the impeller and the water pump from the inertial forces of the rotating masses, mainly the impeller wind turbines. To eliminate this phenomenon provides a hydropneumatic damper 5, the cavity of which is connected at the bottom with a discharge pipe 3, the upper gas pipeline 11. The volume of the upper cavity of the damper 5 allows you to smoothly retard the rotation shaft of the wind turbine, excluding the increased inertial load.

It should be noted that with a slight deceleration of the flow by the flow limiter 8 (to stop the hydraulic pump 1) the working pressure is th fluid will increase, together with an increased torque on the shaft of the hydraulic pump 1 and reducing the frequency of rotation of the impeller shaft of a wind turbine, which is a favorable factor.

At low wind loads, below par, the piston of the hydraulic cylinder 4 is always in the lowest position and the working fluid from the hydraulic pump 1 is directly supplied to the motor 9 of the generator through a flow limiter 8, which at this time is in a state of maximum flow freely passing through all of the working fluid.

Naturally, as in all such cases, it is necessary to use a frequency Converter, which must be maintained at the correct frequency. Thus, the action of the hydraulic system can be called cyclic, providing a constant flow at a constant pressure of the working fluid in all modes of wind loads, except below the nominal load. The cyclic action of the hydraulic system increases the reliability and life of the whole plant. An important advantage of this setup is that it allows the use of commercially available components (cylinder, damper, oil tank etc), which significantly reduces the cost of manufacture of the product. The proposed setup allows you to achieve 2-3% accurate maintenance is astate of rotation of the asynchronous generator, in the conventional mass production.

1. Wind power installation with a hydraulic actuator that contains a wind turbine mounted on its shaft hydraulic pump and hydraulic motor connected to the shaft of the generator, wherein the hydraulic motor is equipped with a flow limiter, and between the hydraulic pump and the hydraulic actuator is a hydraulic cylinder with hydraulic and pneumatic cavities separated by a piston, which is connected with shutoff valve on the delivery pipe of the hydraulic cylinder, the piston of the hydraulic cylinder equipped with cargo, and/or pneumatic cylinder chamber is connected with a pneumatic system.

2. Wind power installation according to claim 1, characterized in that the hydraulic drive is equipped with hydro-pneumatic damper.



 

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