A low-speed direct-drive hydraulic ocean current power generation device and its control method

Abstract

The invention belongs to the field of ocean current energy power generation, and particularly relates to a low-speed direct-drive hydraulic ocean current power generator and a control method thereof. The low-speed direct-drive hydraulic ocean current power generator comprises an impeller, a quantitative hydraulic pump, a volume-adjustable hydraulic pump, a volume-adjustable hydraulic motor and a power generator, wherein the quantitative hydraulic pump is connected with a spindle of the impeller, the volume-adjustable hydraulic pump and the volume-adjustable hydraulic motor are connected with the quantitative hydraulic pump in parallel and connected with an outlet of the same. An inlet of the quantitative hydraulic pump, outlets of the volume-adjustable hydraulic pump and the volume-adjustable hydraulic motor are connected with an oil tank. The volume-adjustable hydraulic pump and the spindle of the volume-adjustable hydraulic motor are in rigid connection. The other end of the spindle of the volume-adjustable hydraulic motor is connected with the spindle of the power generator. The control method includes steps of 1, converting ocean current energy into mechanical energy through the impeller; 2, converting the mechanical energy into hydraulic energy through the quantitative hydraulic pump; 3, converting the hydraulic energy into mechanical energy through the volume-adjustable hydraulic motor; and 4, converting the mechanical energy into electric energy through the power generator.

Description

technical field [0001] The invention belongs to the field of ocean current power generation, and in particular relates to a low-speed direct-drive hydraulic type ocean current power generation device and a control method thereof. Background technique [0002] Ocean current energy has high energy density, cleanliness, and strong predictability, and ocean current energy does not occupy valuable land resources for power generation. Therefore, the development and utilization of ocean current energy has far-reaching significance. However, it is difficult for ocean current generating sets to design "rated operating points" like traditional energy machinery (hydraulic turbines, gas turbines, etc.), because the speed of water flow is changing, and the speed of the impeller can only maintain an "optimal ratio" with the changing fluid speed. ", in order to capture the maximum energy. On the other hand, considering the working efficiency of the generator and the stability of the outp...

AI Technical Summary

Problems solved by technology

However, the direct drive transmission technology has the following disadvantages: 1. The maximum energy capture of the unit also requires complex power electronic devices; 2. When the unit is running, the generator must either run at variable speed to capture the maximum power of the impeller, or run at a constant speed to ensure stable output of the generator , so the two control objectives of maximum power tracking and stable output of the generator can only be selected; 3. The direct drive motor has problems such as too large size, difficult installation and maintenance, and high production cost.

Images