Integrated wind and solar energy conversion and energy storage power system

Abstract

The invention discloses an integrated wind and solar energy conversion and energy storage power system which comprises wind energy storage units, a pressure tank and a solar heat collection pressure device, wherein the wind energy storage units comprise wind collection fans, speed changers, air compressors and air storage tanks; rotating shafts of the wind collection fans are connected with input shafts of the air compressors in a transmission manner by the speed changers; compressed air outlets of the air compressors are connected with the air storage tanks by pipelines provided with one-way valves; the air storage tanks are connected with the pressure tank by pipelines provided with one-way valves; the solar heat collection pressure device comprises a solar heat collector and a heat exchanger; the heat exchanger is arranged in the pressure tank; and the two ends of the heat exchanger are arranged outside the pressure tank, and connected with the solar heat collector to form a closed loop. The power system has the advantages that compressed air is generated by wind energy, and then heated by solar energy; generated high pressure gas drives a power device to complete energy conversion; and a complementary effect of the wind energy and the solar energy is achieved in a physical energy link.

Description

Technical field: [0001] The invention relates to a power system, in particular to a wind energy, solar energy comprehensive conversion and energy storage power system. Background technique: [0002] Energy is the basic need for the existence of human society. With the development of human society, the total demand for energy is getting higher and higher, the consumption speed is getting faster and faster, and the requirements for energy quality and quantity are increasing day by day. At the same time, the per capita consumption of secondary energy (such as electricity, oil, etc.) in energy is proportional to people's living standards and happiness index at some levels. [0003] However, because there is still a certain gap in the level of scientific and technological civilization of human society, the source of most of the secondary energy consumed is basically non-renewable fossil energy. Although there is a lot of room for the use of nuclear energy, the current level of a...

AI Technical Summary

Problems solved by technology

[0010] 1] The density of the range of available wind energy is low, coupled with the inherent characteristics of this collection method, the utilization rate of wind energy is low

[0011] 2] The unit wind power generation system occupies a large land area and three-dimensional space

[0012] 3], the adaptability to wind speed is small

[0013] 4] Due to the uncontrollability of the wind force and time, the stability of the power output is poor

[0014] 5] There is no storage and buffer link. If batteries or batteries are used to store energy, the construction and operation costs will increase a lot, and the scale is limited

[0015] 6] The cost of disposal of scrapped batteries or batteries is very high, and the environmental impact is great

[0016] 7], because the inverter needs to be carried out before grid connection, there are certain harmonics, which have a certain impact on the power quality; the power quality also has a certain impact on the safe operation of the power system

[0025] 16] The capacity of the unit power generation system (single wind turbine) is limited, and the construction cost of the low voltage ride-through function is relatively high, and due to the scattered layout, the reliability is reduced and the maintenance cost is increased

[0026] 17] If pumped storage is used, in addition to the construction of water sources and storage (reservoirs), the conversion from wind energy to power generation requires multiple conversions (wind energy-electric energy-water potential energy-electric energy), and the efficiency is greatly reduced; and the environment High requirements and construction costs, poor broad-spectrum

[0027] 18] Uncontrollable scale and time of wind power sources, no large-scale storage, when the power load is low or no load, the generated power cannot be connected to the grid, and the phenomenon of wind abandonment is very common, resulting in waste of resources and affecting the economy of wind power companies benefit

[0028] 2. The current solar power generation system

[0031] 1] Solar energy is seriously affected by factors such as time, season, climate, and geographical location. Human beings are currently unable to control the source of solar energy in terms of time and value, so the power source of solar photovoltaic power generation systems is very unstable.

[0032] 2] The solar photovoltaic power generation system must be installed with an energy storage system to stabilize and store electric energy. Under the current technical conditions, batteries or batteries used to store electric energy have high unit electric energy storage costs, limited unit storage power, high operation and maintenance costs, and long service life. Shorter and other issues, the scale of electric energy storage is limited

[0033] The above links are also one of the main problems that cause high construction and operation costs of solar photovoltaic power generation systems.

[0034] There are also cost and environmental pollution problems in the disposal of scrapped batteries or batteries

[0035] 3] The utilization rate of solar energy is low

Its main raw materials are high-purity crystalline silicon and other rare metals, and its purification technology is mastered in few countries. The cost of raw materials is high, and the cost of solar cell manufacturing equipment is also high, which is also the overall cost of solar photovoltaic power generation systems. One of the main factors of the higher

[0038] 5] The pre-production process (raw material smelting) of crystalline silicon, which is the main raw material for solar panels, is itself a high-energy-consumption and high-pollution industry, with high resource and environmental costs

[0039] 6] Solar photovoltaic power generation also requires inverters to be connected to the grid, and there are also problems such as harmonics and tracking speed in power quality

[0040] 7] Some heavy metals are required in the manufacture of some solar cells, which will be lost in long-term operation, and will also pollute soil and water resources, and it is difficult to control and restore, and the environmental cost is high

[0041] 8] Influenced by the power grid system structure, in the process of solar power generation system construction planning, one-sided pursuit of scale benefits, and insufficient attention to the planning of micro-grid structure, is a concentrated reflection of the lack of objective and scientific application of solar photovoltaic power generation systems , is also one of the main reasons for the unsatisfactory application range and application volume

[0042] 9] The most important reason affecting the rapid and large-scale application of solar photovoltaic power generation systems is that their construction and power generation costs are too high, the operating life of the system accounts for a large proportion of the investment recovery period, and the investment recovery period is relatively long

[0043] Due to the influence of various factors based on the above reasons, the rapid and large-scale application of solar power generation systems is restricted, making it the main limiting factor for solar power generation to occupy a certain proportion of actual power sources.

[0044] 10], due to factors such as scale and cost, the solar thermal power generation system is still in the trial stage and needs to be developed

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