Off-grid ocean current energy power generation device and control method thereof

Abstract

The invention relates to an off-grid ocean current energy power generation device and a control method thereof. The off-grid ocean current energy power generation device comprises a vane wheel, wherein a rotating shaft of the vane wheel is connected with a main shaft of a first volume adjustable hydraulic pump, an inlet of the first volume adjustable hydraulic pump is connected with an oil tank, an outlet of the first volume adjustable hydraulic pump is connected with a second volume adjustable hydraulic pump and a constant displacement hydraulic motor which are connected in parallel, an output shaft of the constant displacement hydraulic motor is connected with a main shaft of the second volume adjustable hydraulic pump, a hydraulic transformer is formed by the second volume adjustable hydraulic pump and the constant displacement hydraulic motor, an outlet of the second volume adjustable hydraulic pump is connected with the oil tank, an outlet of the constant displacement hydraulic motor is connected with a variable displacement hydraulic motor, the outlet of the variable displacement hydraulic motor is connected with the oil tank, an output shaft of the variable displacement hydraulic motor is connected with a main shaft of a generator, and an output end of the generator is connected with a load. According to the off-grid ocean current energy power generation device and the control method thereof disclosed by the invention, a hydraulic transmission mode is adopted to realize the maximum power tracking control of the vane wheel and the constant frequency output control of the generator.

Description

technical field [0001] The invention relates to an ocean current energy generating device and a control method thereof. Background technique [0002] As a new energy source, ocean current energy has huge global reserves, high energy density, and strong predictability, and has attracted much attention. Current ocean current power generation devices can be divided into grid-connected and off-grid. The grid-connected ocean current energy generation device mainly inputs the collected ocean current energy into the power grid without considering the load characteristics. However, due to the instability of ocean current power generation, the grid-connected ocean current energy power generation device will have an impact on the grid. There is a certain degree of difficulty. The off-grid ocean current energy power generation device can supply the collected ocean current energy to nearby islands or remote areas, with low transportation cost and strong practicability. [0003] The t...

AI Technical Summary

Problems solved by technology

The wind turbine can only realize the constant frequency operation of the generator under no-load conditions when it is not connected to the grid. After connecting to the grid, the frequency of the generator is also determined by the grid and cannot be controlled by the hydraulic system.

If the wind turbine runs off-grid, since it only has one constant pump and one variable hydraulic motor, that is, there is only one control variable, the maximum power tracking control and the constant frequency output control of the generator cannot be realized at the same time.

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