Control method of hydraulic transmission system of power decoupling wave energy generation device

Abstract

The invention discloses a hydraulic transmission system of a power decoupling type wave power generating device and a control method of the hydraulic transmission system of the power decoupling type wave power generating device. The transmission system is composed of an energy capturing unit, a pressure protection unit, a rectification unit, a voltage transformation unit, a speed regulating unit, an energy storage unit and a power generating unit. According to the hydraulic voltage transformation principle and the transmission system of the device, shaft connection is conducted on a hydraulic motor and a variable pump, low-voltage and large-flow input power is converted into high-voltage and small-flow output power, and therefore output power is more suitable for transmission and control; meanwhile, according to the control method, the voltage transformation ratio is adjusted in real time according to different operation sea conditions to stabilize the output rotation speed of the hydraulic motor and the output rotation speed of an electric generator, a high-voltage bag type accumulator is used for further stabilizing voltage fluctuation, conversion from a voltage transformation network to a quasi-constant-voltage network is achieved, and power coupling of input and output of the transmission system of the wave power generating device is achieved.

Description

technical field [0001] The invention belongs to the technical field of marine wave energy development and utilization, and in particular relates to a control method for a hydraulic transmission system of a power decoupling type wave energy generating device. Background technique [0002] Among many types of marine wave energy generating equipment, hydraulic wave energy generating devices are widely used, mainly because the hydraulic transmission system has large transmission power, small structure, fast response, can realize stepless speed change, and is easy to realize overload protection. and other advantages, and the pump-motor mode switching of the hydraulic system is easy, which is very suitable for low-speed and high-power equipment such as ocean wave power generation. At present, many wave power generation devices that have been maturely used in the world use hydraulic transmission. as a power transmission system. However, due to the characteristics of ocean wave ene...

AI Technical Summary

Problems solved by technology

However, large-capacity accumulators have unfavorable factors such as high cost, heavy weight, and leakage after long-term use. The more important thing is that the power input of low pressure and large flow makes the response of the accumulator slow, and it is easy to mix gas, which seriously affects the hydraulic pressure. normal working state of the system

The above defects not only limit the adjustment and control of power by the hydraulic transmission system, but also increase the unreliability of the system.

[0004] Chinese patent CN 101737241A discloses a "wave power generation energy storage voltage stabilization constant frequency method and its device based on hydraulic transmission". The device mainly relies on a large-capacity accumulator to absorb energy fluctuations caused by wave changes. To achieve the adjustment of the generator speed; this method has a narrow range of speed regulation, which is not suitable for smooth speed control, and will still cause impact on the generator set

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