A wind and solar hybrid power generation system is characterized in that it mainly includes three parts: a wind power generation part, a solar power generation part, and an electric energy storage part, and the three parts are installed on a support device; There are upper, middle and lower baffles between the four pillars. The wind power generation part is installed on the upper baffle. The middle baffle is surrounded by hinged concentrating reflective glass to form a convection air box; the bottom baffle has a solar power generation part. The wind power generator; the wind power generation part includes a bearing box, a bearing and a rotating shaft are installed on the bearing box, a plurality of blades are installed on the rotating shaft, and the end of the rotating shaft is connected with the wind power generator; the blade consists of two parts , one part is the scoop-shaped end of the blade, which pushes the blade to rotate under the action of horizontal wind; the other part is the arc-shaped blade that is close to the rotating shaft of the blade, and the arc-shaped blade cooperates with the vertical convective air to push the blade to rotate; the solar energy The power generation part includes four heat exchangers, the upper surface and the lower surface of each heat exchanger are respectively provided with photovoltaic cells, the photovoltaic cells on the upper surface receive sunlight directly, and the photovoltaic cells on the lower surface receive sunlight reflected by the concentrating reflective glass; Each heat exchanger is hinged with the upper baffle; the storage part of the electric energy is a storage battery, and the storage battery is connected with the photovoltaic cell.
The rise of solar cell temperature will affect the power generation efficiency and output power of the battery in the short term, and long-term operation at high temperature will also cause the rapid aging of the solar cell and seriously shorten its life. Solar cells work well at low temperatures, but at a given light intensity, the output power of solar energy will decrease with the increase of operating temperature, in a linear decreasing relationship, and the service life will decrease accordingly. When it exceeds 90 degrees, the efficiency and temperature components change linearly, and the efficiency drops sharply. When the operating temperature of the solar cell is as high as 200 degrees, the solar cell can only work for 30 minutes. By designing a heat exchange device, the temperature of the solar cell is lowered to improve the power generation efficiency of the solar cell.
The passive cooling system has zero energy consumption and limited cooling temperature. It is mainly used in photovoltaic power generation systems with low light concentration. Typical systems include finned or unfinished aluminum backplane cooling systems and heat pipe cooling systems.
The active cooling system needs to add a pump to implement forced convection heat exchange, and the working medium can be gas or liquid.
Now more and more schools are beginning to pay attention to the technology of combining wind energy and solar energy to generate electricity. Among them, Mr. Ji Bing hou from Inner Mongolia University has conducted research on the solar-wind energy hybrid power generation system, and proposed a method that can balance power supply throughout the year and can provide A system that provides reliable power supply in areas without power grids; Yang Ping from the School of Electric Power, East China University of Science and Technology also studied the wind-solar hybrid power generation system, and proposed a new type of generator and its control system; Shi Hai jun from Shanghai Jiao tong University The teacher proposed an optimal design method for wind and solar complementary power generation systems. Experiments show that the relationship between system economic performance and system configuration and a large number of Pareto optimal solutions can be obtained by using this optimal design method, so that the most satisfactory system solution can be obtained. In addition to a large number of academic papers introducing related technologies, there are also many invention patents involving this field. Combining solar energy and wind energy and complementing the advantages of the two energy sources enables 24-hour power generation to meet the needs of a single family and provide the possibility for large-scale promotion.
The disadvantages of current wind and solar hybrid power generation systems are:
I. Working at high temperature for a long time will also cause rapid aging of the solar cell and seriously shorten its life.
2. The disadvantage of discontinuous wind power affects the power generation of wind power.
3. When the solar energy cannot work at night, it will directly affect the power generation.
4. Traditional solar power generation only utilizes the photoelectric effect of solar energy and does not fully utilize the thermal energy of solar energy, resulting in energy loss.
A wind and solar hybrid power generation system mainly includes three parts: a wind power generation part, a solar power generation part, and an electric energy storage part, and the three parts are installed on a support device; the support device includes four pillars, between the four pillars The upper baffle, the middle baffle and the lower baffle are provided, the wind power generation part is installed on the upper baffle, and a plurality of concentrating balls are arranged on the upper baffle; the middle baffle is provided with hinged concentrating reflective glass to form a convection air box; There is a wind turbine with a solar power generation part on the bottom baffle; the wind power generation part includes a bearing box, a bearing and a rotating shaft are installed on the bearing box, a plurality of blades are installed on the rotating shaft, and the end of the rotating shaft is connected with the wind generator The blade consists of two parts, one part is the spoon-shaped end of the blade, which pushes the blade to rotate under the action of the horizontal wind; blade rotation;
Cooling the solar photovoltaic panels through heat exchange technology can not only prolong the service life of the solar photovoltaic panels, but also improve the power generation efficiency of the solar photovoltaic panels, which can reduce the cost of solar power generation and increase solar power generation. Feasibility of large scale rollout.
The wind power generation part utilizes not only the wind in nature, but also the kinetic energy generated by air convection, which can not only realize the full utilization of energy, but also overcome the disadvantage of discontinuous wind energy. In practical applications, wind energy is affected by wind discontinuity and wind speed. The combination with solar energy can reduce the impact of this limitation to a certain extent; the use of solar energy is greatly affected by time constraints and weather conditions. The addition of wind energy, This situation can be improved. When solar energy cannot work at night, wind energy can work, and the two energy advantages complement each other. The solar energy part of the system not only uses the photovoltaic effect of solar energy to generate electricity, but also makes full use of the thermal energy part of the solar energy. Provided is a hybrid power generation system of wind energy and solar energy, which has the advantages of cooling the solar photovoltaic panel, which can improve the power generation efficiency of the solar photovoltaic panel; not only use the natural wind but also make full use of the kinetic energy generated by air convection to overcome the wind energy. Discontinuous disadvantage; use the complementary energy of wind energy and solar energy; not only use the photovoltaic effect of solar energy but also make full use of the thermal energy in solar energy.
The application direction of wind-solar hybrid power generation should not be based on networked power generation. Wind-solar hybrid power generation is aimed at remote pastoral areas, areas without electricity households and islands. In the case of far away from the large power grid, sparsely populated, low electricity load and inconvenient transportation, use An economical and practical power station built with abundant wind and solar energy in the region. Wind-solar hybrid power generation technology is an effective means to solve the problem of power supply for these people without electricity. In remote areas, the electricity load is generally not large, so it is not economical to use the power grid to transmit electricity. In the local direct power generation, the most commonly used is the use of diesel generators. However, the storage and transportation of diesel is too costly for remote areas, so diesel generators can only be used as a short-term emergency power source. To solve the problem of long-term stable and reliable power supply, we can only rely on local natural energy.
Both wind power generation and solar photovoltaic power generation systems have unbalanced power generation and electricity load due to the uncertainty of resources. Taking advantage of the complementarity of wind energy and solar energy, the development of wind-solar hybrid power generation system can make up for the deficiency of solar energy and wind energy, as shown in Figure 1. The complementarity of solar energy and wind energy in time makes the wind-solar hybrid power generation system have the best possibility of matching resources. The adoption of wind-solar hybrid technology can reduce the capacity of solar cell modules to a certain extent and reduce the cost of the power generation system. Wind-solar hybrid power generation systems with low price and stable performance are more easily accepted by users than single-energy solar or wind power generation systems, and are more conducive to promotion.
The wind-solar hybrid power generation system is a device that converts light energy and wind energy into electrical energy. Due to the strong complementarity of solar energy and wind energy, the wind-solar hybrid power generation system makes up for the intermittent, unbalanced and unstable resources of the wind and solar independent power generation systems. The system capacity can be reasonably configured according to the user’s electricity load and resource conditions, which can not only ensure the reliability of the power supply, but also reduce the cost of the power generation system.
Wind-solar hybrid power generation systems can be divided into grid-connected wind-solar hybrid power generation systems and off-grid wind-solar hybrid power generation systems according to whether they are integrated into the public grid system. The off-grid wind-solar hybrid power generation system is a self-generated and self-used power generation system independent of the public power grid, and is often used to supply power to remote users without electricity; the grid-connected wind-solar hybrid power generation system is a power generation system that provides power to the public grid. Usually, the capacity of off-grid hybrid wind-solar power generation system is 100W to 100kW, and the capacity of grid-connected wind-solar hybrid power generation system can reach hundreds of kilowatts or even megawatts.
The optimal configuration of the wind-solar hybrid power generation system can ensure the reliability of the power supply of the system and reduce the cost of the power generation system. No matter what kind of environment and what kind of electricity requirements, the wind-solar hybrid power generation system can make the optimal system design scheme to meet the requirements of users. It should be said that the wind-solar hybrid power generation system is the most reasonable independent power system. This rationality is reflected in the most reasonable resource allocation, the most reasonable technical solution, and the most reasonable performance price. It is this rationality that ensures the high reliability of the wind-solar hybrid power generation system. At present, the biggest obstacle to the promotion of wind-solar hybrid power generation systems is the reliability of small and medium-sized wind turbines.
The wind-solar hybrid power generation system that comprehensively utilizes wind energy and solar energy can not only provide low-cost, high-reliability power supply to areas with inconvenient power grids, but also open up a new way to solve the current energy crisis and environmental pollution. Wind-solar hybrid power generation system is a new achievement of scientific utilization of natural resources. It has the following advantages:
1) Utilize the complementarity of wind energy and solar energy to make up for the insufficiency of independent wind power generation and independent photovoltaic power generation system, and obtain a relatively stable and reliable power supply
2) Make full use of land resources. Wind power generation equipment uses high-altitude wind energy, and photovoltaic power generation equipment uses ground solar energy under wind turbines to achieve an effective combination of ground and high altitude.
3) Under the condition of ensuring the same power supply, the capacity of the energy storage battery can be greatly reduced.
4) Reasonable design and matching of the wind-solar hybrid power generation system can realize reliable power supply by the wind-solar hybrid power generation system, with little or no need to start backup power sources such as diesel generator sets, etc., and obtain better social and economic benefits.
5) As the wind-solar hybrid power generation system shares a set of power distribution equipment, the project cost is reduced; a group of management and engineering technicians are shared, which improves labor efficiency and reduces operating costs.
