WO2011094907A1

WO2011094907A1 - Evaporative cooling wind-energy pumped-storage combined generating system

Info

Publication number: WO2011094907A1
Application number: PCT/CN2010/000808
Authority: WO
Inventors: 阮琳; 顾国彪; 钱光岳
Original assignee: 中国科学院电工研究所
Priority date: 2010-02-08
Filing date: 2010-06-09
Publication date: 2011-08-11
Also published as: CN101787950A

Abstract

An evaporative cooling wind-energy pumped-storage combined generating system includes a wind power generating equipment (1) and a water pump (2), wherein the output end of the wind-power generating equipment (1) is connected with the input end of the water pump (2) by a connection mechanism (10). The water inlet and outlet of the water pump (2) are communicated with a lower water reservoir (3) and an upper water reservoir (4) through a water pumping pipe (11) and a water outlet pipe (12) respectively. The water inlet and outlet of a pumped-storage set (5) are communicated with the upper water reservoir (4) and the lower water reservoir (3) through a generation water diversion pipe (14) and a water drain pipe (13) respectively. The wind-power generating equipment (1) and the pumped-storage set (5) are both cooled in a stator evaporation cooling manner.

Description

Evaporative cooling wind energy pumped storage combined power generation system

The invention relates to a combined pumping and energy storage device using wind energy.

Background technique

As the world's energy shortages and global warming trend increase, as one of the important means of energy conservation and emission reduction, the world's wind power generation is developing rapidly and technology is advancing. In the past five years, the world wind power market has grown at a rate of (40%) every year. China's wind power market has also shown a good development trend in recent years. However, wind power generation is affected by the regional environment, which is unstable, and the reliability of power generation is poor. It is difficult to meet the power quality requirements of the power grid. Under the current technical conditions, it is necessary to build a large number of wind farms composed of wind turbines. The grid (at least ten times the capacity of the wind farm) can be operated in parallel to achieve the performance of wind power. This is limited in many situations, such as some small-grid areas with abundant wind energy (such as Xinjiang and islands). Therefore, the efficient use of wind energy and the reliability of power supply for wind power generation equipment have become the focus of attention. The increase in energy storage and the improvement of equipment cooling mode can effectively solve this problem. Pumped storage units are mostly used for peak frequency modulation. It is necessary to start and stop frequently, using conventional air cooling method, the cooling effect is not good, the temperature distribution is poor, and it is easy to cause thermal deformation or insulation damage of the wire rod, which affects the reliability and life of the motor. Extending equipment life and improving operational reliability by improving cooling is an important breakthrough.

The evaporative cooling technology utilizes the latent heat of vaporization of the low-boiling medium to achieve heat exchange with the object to be cooled. The heat absorption capacity of the unit mass of the cooling medium is much larger than that of the conventional specific heat exchange mode. Moreover, the principle of phase change heat determines that the temperature distribution depends only on the system pressure, so that the temperature distribution of the heat-generating component of this cooling mode is very uniform. At the same time, the evaporative cooling medium has good physicochemical stability and insulation properties, as well as evaporation The cooling system can realize self-circulation without pump and keep the cooling system running near the zero gauge pressure, and can realize adaptive adjustment according to different working conditions of the heating element, and ensure the safe and reliable operation of the cooling system.

The evaporative cooling device for a steam turbine and a hydro-generator stator disclosed in Chinese Patent No. 02122112.X provides a steam evaporating and cooling device for a steam turbine and a hydro-generator, including an evaporative cooling chamber for immersing a heating element of the motor stator in a cooling medium. A condenser mounted on the evaporative cooling chamber for heat exchange with the cooling medium vapor. The bottom of the condenser communicates with the upper evaporation space of the evaporative cooling chamber through a one-way valve block. There is a liquid return tank at the same horizontal position adjacent to the condenser, and a connecting pipe is connected between the bottom of the bottom and the bottom of the condenser, and a liquid returning pipe with a check valve and a solenoid valve is passed through the set liquid level. The evaporation spaces of the evaporative cooling chamber are connected. The heat generated by the loss of the stator component is transferred to the evaporative cooling medium to raise its temperature. When the temperature reaches the saturation temperature corresponding to the pressure, the evaporative cooling medium in the vessel vaporizes to generate a phase change endotherm, which is cooled by the air condenser. liquefaction. The stator uses the phase-converted heat of evaporative cooling to perform high-efficiency cooling, so that the generator stator temperature distribution is uniform, the operating temperature is low, there is no local hot spot, safe and reliable, and the structure is simple and easy, the motor size is small, and the power density is large.

Chinese Patent No. 01131399.4 discloses an evaporative cooling device for a stator winding of a hydroelectric generator, which is a fully enclosed self-circulating system filled with a cooling medium. The stator winding of the generator is composed of a hollow conductor and a solid conductor, and the stator winding is The upper and lower ends are respectively connected to the upper insulating tube and the lower insulating tube through the upper and lower electro-hydraulic separation joints; the upper insulating tube is connected through the condensation space of the gas collecting tube and the condenser, and the lower insulating tube passes through the collecting tube and the liquid return tube The lower ends are connected, and the plurality of liquid return pipes are connected in parallel through the collecting pipe. This self-circulating evaporative cooling device is characterized by the use of the vertical structural characteristics of the hydro-generator to achieve a pump-free self-circulation of the cooling system.

Chinese Patent No. 200610076416.7 discloses a wind-pumped-storage power generation peaking device, which utilizes a smoke-guided wind tower to realize the utilization of wind energy. The size of the wind has a great relationship with the height and size of the chimney. The equipment has a large footprint and low efficiency. Moreover, the wind energy acquisition process is complicated, and the heat pump expander and the heat pump condenser are required to additionally process the acquired wind. Summary of the invention

The object of the present invention is to overcome the shortcomings of the existing power generation of the wind power generation, which causes the power quality of the grid to decrease, and convert the unstable wind energy into a stable power output through the energy storage technology. That is, the renewable wind energy is converted into electric energy, the pump is driven to pump and store energy, and then the water is generated according to the demand of the power grid, and the pumping and storage unit is used to increase the energy storage capacity and the adjustment range. Can drive the use of conventional hydro generator sets.

The invention directly utilizes a conventional blade system to capture wind energy, and has better effectiveness and technical maturity. In addition, the pumped storage unit is used instead of a single water turbine generator, which can be combined with the wind energy system to increase the energy storage capacity and adjustment range. By using the stator evaporative cooling method for the wind power generation equipment and the pumped storage unit in the device of the present invention, the capacity limitation of the power generation equipment can be broken, and the service life and operational reliability of the equipment can be improved.

The evaporatively cooled wind energy pumped storage combined power generation system of the present invention comprises a wind power generation device, a water pump, a lower reservoir, an upper reservoir and a pumped storage unit, a connecting mechanism, a water pumping pipe, and a pumping unit. Outlet pipe, a power generation water pipe and a draft tube. It is characterized in that the wind power generation equipment and the pumped storage unit in the system adopt the stator evaporative cooling method.

The output end of the wind power generation device of the present invention is connected to the input end of the water pump through a connection mechanism, and the pumping port of the pump is connected to the lower reservoir through the water pump, and the water outlet of the pump is connected to the upper reservoir through the water outlet pipe, and the pumping water is stored. The water inlet of the unit is connected to the upper reservoir through the power generation water pipe. The water outlet of the pumped storage unit is connected to the lower reservoir through the draft tube. When the outside wind is sufficient, the wind power generation equipment generates electricity. The output end is connected with the pump through a connecting mechanism, and the driving pump is pumped from the lower reservoir through the water pump and then sent to the upper reservoir through the outlet pipe.

The wind power generation device adopts an immersed stator evaporative cooling device; when the pumped storage unit is a horizontal structure, the pumped storage unit adopts an immersed stator evaporative cooling device, and the pumped storage unit is a vertical structure. At the same time, the pumped storage unit adopts a stator winding self-circulating evaporative cooling device.

The invention is characterized in that the base value electric energy of the wind power generation can be directly connected to the Internet, the stability of the power grid can be ensured, the peak electric energy is used for pumping and storing energy, and the electric power output of the pumped storage unit is supplemented, so that the net active output is positive, fully Use renewable energy. When the power grid needs, the pumped storage unit switches the power generation state to discharge water from the upper reservoir. When the grid power load is at a low point, the pumped storage unit switches to the electric state, pumping water from the lower reservoir to the upper reservoir to realize energy storage. Among them, wind power generation equipment and pumped storage units adopt the stator evaporative cooling method with high cooling efficiency and high safety and reliability. The power generation system is simple and reliable, low in operating cost, and energy efficient. The technology is mature and reliable, with high power generation efficiency and excellent power quality. It is a clean and efficient combined power generation system. DRAWINGS

Fig.1 Schematic diagram of structure 1 of evaporatively cooled wind energy pumped storage combined power generation system; Fig. 2 Schematic diagram of structure 2 of evaporatively cooled wind energy pumped storage combined power generation system; Fig. 1, 1 wind power generation equipment, 2 pumping pumps, 3 lower reservoirs, 4 Upper reservoir, 5 pumped storage units, 10 connection mechanisms, 11 pumping pipes, 12 outlet pipes, 13 tail pipes,

14 is an electric water conduit.

In Fig. 2, 1 wind turbine blade, 2 pumping pump, 3 lower reservoir, 4 upper reservoir, 5 pumping water storage unit, 10 connecting mechanism, 11 water pumping pipe, 12 water outlet pipe, 13 water pipe,

14 is an electric water conduit. detailed description As shown in FIG. 1, the evaporatively cooled wind energy pumped storage combined power generation system of the present invention comprises a wind power generation device 1 and a water pump 2, and an output end of the wind power generation device 1 is connected to an input end of the water pump 2 through a connection mechanism 10. The pump 2 is an electrically driven pump. The pumping port of the pump 2 is connected to the lower reservoir 3 through the pumping pipe 11, and the water outlet of the pumping pump 2 communicates with the upper reservoir 4 through the outlet pipe 12, and the water inlet of the pumping and storage unit 5 passes through the power generating water pipe 14 and the upper reservoir. 4 phases are connected. The water outlet of the pumped storage unit 5 communicates with the lower reservoir 3 through the draft tube 13. When the outside wind power is sufficient, the wind power generation device 1 generates power outward, and the output end thereof is connected to the water pump 2 through the electric connection mechanism 10, and the driving pump 2 is pumped from the lower reservoir 3 through the suction pipe and then sent to the upper reservoir 4 through the outlet pipe 12. When the power grid needs, the pumped storage unit 5 switches the power generation state from the upper reservoir 4 to discharge water. When the grid power load is at a low point, the pumped storage unit 5 switches to the electric state, pumping water from the lower reservoir 3 to the upper reservoir 4 to store can.

DETAILED DESCRIPTION 2:

As shown in FIG. 2, the evaporatively cooled wind energy pumped storage combined power generation system of the present invention comprises a rotor blade 1, a pump 2, and an output end of the rotor blade 1 is connected to an input end of the pump 2 through a connection mechanism 10. The pump 2 is a mechanically driven pump. The water pumping port of the pump 2 is connected to the lower reservoir 3 through the water pumping pipe 11, and the water outlet of the pumping water 2 is connected to the upper reservoir 4 through the water outlet pipe 12, and the water inlet of the pumping and energy storage unit 5 passes through the power generating water pipe 14 and the upper reservoir 4 Connected. The outlet of the pumped storage unit 5 communicates with the lower reservoir 3 through the draft tube 13 .

The wind power generation device 1 of the present invention adopts an immersed stator evaporative cooling device; when the pumped storage unit 5 is of a horizontal structure, the pumped storage unit 5 adopts an immersed stator evaporative cooling device, and when the pumped storage unit 5 is standing In the case of the structure, the pumped storage unit 5 employs a stator winding self-circulating evaporative cooling device.

Claims

Rights request

An evaporatively cooled wind energy pumped storage combined power generation system, characterized by comprising a wind power generation device [1], a water pump [2], a wind power generation device [II output end through a connection mechanism [101 and a pump [21] The input end is connected; the pumping port of the pump [21 is connected to the lower reservoir [31] through the pumping pipe [11], and the water outlet of the pump [21 passes through the outlet pipe

[12] communicated with the upper reservoir [4], the water inlet of the pumped storage unit [5] passes through the power generation water conduit

[141 is connected with the upper reservoir [41]; the outlet of the pumped storage unit [5] is connected to the lower reservoir [ ³ ] through the draft tube [131].

2. The evaporatively cooled wind energy pumped storage combined power generation system according to claim 1, wherein said wind power generation device W employs an immersed stator evaporative cooling device; and said pumped storage unit [51 is a horizontal structure At the same time, the pumped storage unit [5] adopts the immersed stator evaporative cooling device. When the pumped storage unit [5j is a vertical structure, the pumped storage unit [51 adopts the stator winding self-circulating evaporative cooling device.

3. The evaporatively cooled wind energy pumped storage combined power generation system according to claim 1, wherein the wind power generation device [1] is replaced by a wind driven blade; the output end of the wind blade [11] is connected. The mechanism [10] is connected to the input of the pump [21].