A control method for grid-connected power generation of offshore wave energy based on active inverter

Abstract

The invention discloses an active-inverter-based offshore wave energy grid-connected power generation system and a control method. The system comprises a wave energy collection device, a power generation device, an electric energy conversion circuit and a detection control circuit, wherein the wave energy collection device comprises a plurality of wave energy collection units which are connected, a common transmission shaft of the wave energy collection units is connected with a gear box, and the wave energy collection device is used for converting wave energy into mechanical energy; the power generation device is used for converting the mechanical energy into electric energy; the electric energy conversion circuit comprises a rectification circuit and an inverter circuit and used for achieving inversion grid connection of electric energy and regulating the grid connection output power, and the output end of the electric energy conversion circuit is connected with a power grid; the detection control circuit is used for detecting various parameters of the system during operating and controlling the system. According to the system, the modular wave energy collection device is used for converting wave energy into mechanical energy which is converted into the electric energy finally; through coordinate-transformation-based current control, inversion grid-connected operation under unity power factors is realized; and meanwhile, through a maximum power point tracing algorithm, the system operates in a maximum power output state all the time, and the wave energy is utilized to the maximum extent.

Description

technical field [0001] The invention relates to the field of new energy power generation, in particular to a control method for offshore wave energy grid-connected power generation based on active inverter. Background technique [0002] At present, human energy consumption is increasing, energy supply is becoming increasingly tense, and new energy power generation technology has been rapidly developed. Among them, wave power generation technology has been more and more used as an effective new energy generation method. Ocean waves contain enormous energy, and the amount of economically valuable wave energy mining in the world is estimated to be hundreds of millions of kilowatts. The application of wave power generation technology can alleviate the current energy shortage to a certain extent. [0003] With the development of power electronics technology, new energy grid connection has been widely used. Compared with solar and wind energy, wave energy has higher energy dens...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a small-scale and low-cost offshore wave energy generation system for the existing wave energy generation device with fixed structure, large volume, high cost, and inflexible configuration. The device is composed of wave energy harvesting units, which can easily change the number of wave energy harvesting units and flexibly adapt to different power generation requirements. The system realizes the grid connection of electric energy through active inverter technology, and uses the maximum power point tracking algorithm to realize the output power. maximize

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