Wave energy absorbing and converting device and power generation system

Abstract

The invention discloses a wave energy absorbing and converting device and a power generation system. The device comprises a floating body, a guide shaft, a resistance disc and a counter mechanism, wherein the counter mechanism is arranged at an motion interval of the resistance disc; the guide shaft is connected with the bottom of the floating body, the resistance disc relatively movably sleeves the guide shaft; counter force of the counter mechanism is opposite to the natural motion direction of the resistance disc so that the resistance disc can remain a relatively stationary state in waterunder own resistance effects and the cooperation of the counter mechanism, then the resistance disc, within a wave height range designed by the device, does not make contact with a limiting structure,a floating body and the like whether in the upper portion or the lower portion. When the floating body drives the guide shaft to move up and down under action of waves, relative motion is generated between the floating body and the resistance disc so as to output kinetic energy; and the kinetic energy is received and converted by a power generation device, and namely outputting electric energy. According to the wave energy absorbing and converting device and the power generation system, simple structure improvement is utilized, so that the wave energy utilization rate is significantly improved, thus reducing power generation cost of wave energy as well as solving the problem of power demands of offshore remote islands and reefs for power supply and seawater desalination.

Description

technical field [0001] The invention relates to a power generation device, in particular to wave energy power generation technology. Background technique [0002] At present, the following methods are commonly used in wave energy generation devices: [0003] 1. Convert wave energy into hydraulic energy, drive the turbine connected to the generator to rotate, and then make the generator rotate to generate electricity. For example, the water snake wave energy generation equipment of Scotland Pelamis Wave Energy Company and the OPT wave energy generation device of American Ocean Power Technology (OPT) Company. However, the design of the wave power generation device using this structure is relatively complicated, the cost is high and the maintenance cost is high, and it still has no cost advantage compared with the current dominant thermal power generation and hydropower generation. [0004] 2. Convert wave energy into flowing compressed air, drive the steam turbine to rotate,...

AI Technical Summary

Problems solved by technology

The power generation device solves the problems of complex structure, high manufacturing cost and maintenance cost, and low reliability of long-term operation of the existing wave energy power generation device

[0009] The device is feasible in principle, but there are problems in actual operation: since the device is designed with a resistance disc underwater, according to the design plan, the buoyancy of the resistance disc should be equal to gravity to ensure that the resistance disc is suspended in the movement range In the middle, but this is only an ideal state. In fact, it is impossible to create a resistance disc whose buoyancy is equal to gravity. Moreover, even if the buoyancy of the resistance disc is equal to gravity, the underwater position of the resistance disc is uncontrollable

Therefore, in reality, the resistance disc in the water will always have a tendency to move up or down due to its own gravity or buoyancy. The resistance disc will not be in the middle of the design, and will automatically move to one end of the movement range, so When waves drive the floating body to move up and down, the resistance plate will inevitably contact and collide with the limit structure or the lower end of the piston cylinder in each movement cycle. This kind of contact will cause the piston and cylinder to lose relative motion for a period of time and cannot absorb The energy of the waves, loses the effect of capturing wave energy

In the actual operation experiment, the applicant found that each wave movement cycle is about 7 seconds, and the time for the resistance plate to touch the limit structure and lose relative motion is about 3 seconds, which causes the generator to stop repeatedly. Turning and starting, greatly reducing the power generation efficiency of the device

According to the research of the applicant, compared with the theoretical design state, the efficiency of this situation drops by about 80%. The measured voltage output diagram is as follows: image 3 As shown, it can be seen from the figure that the output voltage of the device is from 0 to 648.2V, which is intermittent and extremely discontinuous, and it is difficult to perform rectification and inversion. application

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