Acquisition method of comprehensive characteristic curve of hydraulic pto system based on wave power generation

Abstract

The invention relates to a wave power generation hydraulic PTO system-based overall characteristic curve obtaining method. The method comprises the following steps of: carrying out an energy experiment after replacing a power generator by a dynamometer, so as to determine operation efficiencies <eta> under different main oil line flows Q, different main shaft rotation speeds n and different hydraulic motor inlet / outlet pressure differences <delta>p; drawing a model overall characteristic curve in a <delta>p-n rectangular coordinate system which takes the hydraulic motor inlet / outlet pressure differences <delta>p as vertical coordinates and the main shaft rotation speeds n as horizontal coordinates, wherein the model overall characteristic curve comprises an equal-displacement line, an equal-mechanical torque line and an equal-efficiency line; and drawing an operation characteristic curve in a Q-N rectangular coordinate system which takes the main oil line flows Q as vertical coordinates and hydraulic motor outputs N as horizontal coordinates, wherein the operation characteristic curve comprises an equal-efficiency line, a maximum flow line, a minimum flow line and an output limit line. According to the method provided by the invention, the continuous high-efficiency electric energy outputs of wave power generation hydraulic PTO systems under complicated sea conditions can be realized.

Description

technical field [0001] The invention belongs to the field of wave power generation, and in particular relates to a method for obtaining a comprehensive characteristic curve of a hydraulic PTO system based on wave power generation. Background technique [0002] As a clean and renewable energy, wave energy has large reserves and a steady stream. The wave power generation device can provide clean electricity to military facilities and residents on the island. The energy conversion system of the wave power generation device consists of an energy harvesting system and a PTO system. The energy harvesting system captures wave energy and converts wave energy into mechanical energy. The PTO system converts mechanical energy into stable electrical energy output. The PTO system depends on its transmission mode , can be divided into hydraulic type, pneumatic type, hydraulic type, mechanical transmission type, special motor type. [0003] At present, the PTO system mostly adopts the hyd...

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Problems solved by technology

[0004] Since the wave power generation hydraulic PTO system has different reciprocating motion rules of the piston rod under different sea conditions, and the obtained flow Q in the main oil circuit is different, it is necessary to adjust the displacement V of the hydraulic motor to maintain the main shaft speed n to be the rated speed of the generator n 0 , Adjust the mechanical torque T of the main shaft through the vector control of the generator to stabilize the pressure difference Δp between the inlet and outlet of the hydraulic motor, and then make the PTO system work at this flow rate and n 0 However, the existing wave power generation hydraulic PTO system does not have a unified comprehensive characteristic curve to guide its selection design and operation control

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