Control system of wave energy converter

Abstract

The invention provides a control system of a wave energy converter. Wave energy is captured through a main hydraulic cylinder and a float, and electricity is generated through the wave energy converter. An electric drive unit in parallel with an auxiliary unit is arranged, the electric drive unit can not only drive a generator to generate electricity, but also act as a speed control mechanism to control the rotating speed of a second variable displacement pump. An oil replenishment voltage stabilizing unit performs oil supplementary speed increasing on the second variable displacement pump, and the electric drive unit and the oil replenishment voltage stabilizing unit cooperate to control the rotating speed and displacement of the second variable displacement pump. A four-quadrant workingmode of a first four-quadrant pump is used to ensure the second variable displacement pump to drive a motor to continuously generate electricity when the float moves up and down, and a high-pressure accumulator and a low-pressure accumulator are designed into metal bellows type accumulators. The energy conversion efficiency and operation stability of the wave energy converter are improved.

Description

technical field [0001] The invention belongs to the field of power generation control of wave energy converters, in particular to a control system of wave energy converters. Background technique [0002] China has a long coastline, and the average theoretically developable power of wave energy reaches 12.85GW. As a clean and renewable energy source, large-scale development of wave energy can reduce greenhouse gas emissions, and among various ocean energy resources, wave energy has a higher energy flow density and is easier to realize miniaturization, which contributes to the Development and coastal defense construction, so using wave energy to generate electricity is an effective measure to solve energy problems, and further improving the conversion efficiency and stability of wave energy devices is an important trend in the development of wave energy utilization technology. [0003] The wave energy device can be divided into two parts. The first part is the wave energy ca...

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Problems solved by technology

[0007] The present invention overcomes the lack of an effective speed control mechanism in the variable displacement hydraulic pump driving the generator in the prior art, and the pressure in the hydraulic pipeline of the wave energy converter is unstable, the output of electric energy is unstable, and the efficiency of energy conversion is low. technical problem

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