Compound grid system generating electricity through tidal current energy and electric energy distribution method thereof

Abstract

The invention discloses a compound grid system generating electricity through tidal current energy. The compound grid system generating electricity through tidal current energy comprises a microgrid subsystem composed of an intermittent energy electricity generation system, an energy storage system and a local load. The compound grid system generating electricity through tidal current energy further comprises a tidal current energy electricity generation system and an external power grid system which are merged into the microgrid subsystem. The invention provides an electric energy distribution method of the compound grid system under various operating states. By means of the multi-energy complement electric energy distribution method, electricity needs of islands or coastal areas with poor electricity supply capacity can be ensured, external grids can be supplied with electricity when energy is surplus so that certain economic benefits can be obtained, and the method is of great significance in economical development of coasts and islands. A tidal current energy electricity generation device is installed on a pier of an existing bridge in an attached mode and can be moved to the position above the water surface when the tidal current energy electricity generation device breaks down, the cost of a unit foundation can be avoided or greatly lowered, and maintenance of the tidal current energy electricity generation device is facilitated.

Description

technical field [0001] The invention relates to the technical field of tidal current energy generation, in particular to a composite power grid system utilizing tidal current energy to generate electricity and an electric energy distribution method thereof. Background technique [0002] Tidal current power generation is a technology that uses the kinetic energy of the tidal current to generate electricity. Generally, it does not need to build a dam and has the advantages of low impact on the environment. In recent years, it has received extensive attention, and tidal current power generation technology has developed rapidly. [0003] At present, most of the power supply systems for remote areas and isolated islands are multi-energy complementary micro-grid systems. For example, the invention application (application number: 201310264451.1, the public date is 2013.9.18) discloses a multi-energy complementary independent power generation The system includes a solar power gener...

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Problems solved by technology

In 2012, Harbin Engineering University master's degree thesis "Research on load distribution technology of typical island multi-energy complementary power station" (author: Zhao Yang) disclosed the load distribution technology of island multi-energy complementary power station, only for a single microgrid system with multiple resources The working mode and conversion are described and explained, and the association and feedback with the external power grid under various limit states are not involved

[0004] It can be seen that the above-mentioned existing multi-energy complementary independent power generation system using tidal current energy obviously still has inconvenience and defects in structure, method and use, and needs to be further improved urgently.

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