Micro-grid system of grid-connected island power grid

Abstract

The invention discloses a micro-grid system of a grid-connected island power grid. The system comprises an energy storage system, a power distribution network load system, a diesel power generating system, a wind driven generator system, an optical fiber communication network, and a micro-grid energy coordinated optimization and control system. The energy storage system accesses an AC bus of an island power grid through a boosting transformer. The power distribution network load system makes user load ends connected with a power distribution network load transformer through fast solid-state switches. The diesel power generating system is used as a main power supply when the micro-grid system is in isolated island operation. The wind driven generator system comprises an asynchronous wind generating set. The stator output sides of the asynchronous wind generating set are connected in series with back-to-back converters. The output of the back-to-back converters is transmitted to the AC bus of the island power grid through boosting. In the island power grid, optical fibers are set up along a power transmission and distribution line, and optical fiber communication transmitter-receiver devices are installed on power supply points, load points, and control terminals, so as to form the optical fiber communication network of the island power grid. The micro-grid energy coordinated optimization and control system collects island power grid operation data in real time through the optical fiber communication network, and releases control instructions.

Description

Technical field [0001] The invention belongs to the technical field of engineering application of microgrid technology, and specifically relates to a microgrid system of a grid-connected island power grid. Background technique [0002] my country's islands are rich in resources, and most of the islands and surrounding waters are rich in renewable resources, such as wind energy, solar energy, wave energy, and tidal energy. Vigorously developing island power grids and building an efficient and clean island energy system can not only ensure stable power supply on islands, but also have important significance for protecting the marine environment and promoting energy conservation and emission reduction. my country promulgated the "Island Protection Law of the People's Republic of China" at the end of 2009, and it has clearly stated that "the development and construction of islands with residents should give priority to the use of renewable energy such as wind, ocean, and solar energy...

AI Technical Summary

Problems solved by technology

The grid-connected island power grid belongs to the actual business area of ​​the power grid. The construction of a new micro-grid will not only lead to unnecessary abandonment of the original grid lines and equipment, but also cause a huge amount of investment and engineering volume.

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