Method for realizing on-grid and off-grid dual-mode running of dual-directional converter in micro-grid

Abstract

The invention discloses a method for realizing on-grid and off-grid dual-mode running of dual-directional converter in micro-grid, which comprises the following steps of: detecting whether the macro-grid loses power or recovers power supply by an on- and off-grid controller in the micro-grid, sending 'ready to be off grid' or 'off grid' or 'ready to be on grid' or 'on grid' commands to the dual-directional converter via two binary coding interfaces, meanwhile allowing the on- and off -grid controller to communicate with a micro-grid control system, and sending charge and discharge power command signals by the micro-grid control system to make the dual-directional converter act correspondingly. When the micro-grid loses power, the dual-directional converter is shifted from the on-grid running state into the off-grid running state and switched into the voltage resource working mode without extra equipment investment, so the problem that an accumulation system and a photovoltaic on-grid inverter fails to work when the micro-grid loses power, the problem that it is difficult to construct a micro-grid system and the problem that the seamless switching between the off-grid running and on-grid running under micro-grid control fails are solved.

Description

technical field [0001] The invention relates to the field of micro-grids, in particular to a method for a bidirectional converter in a micro-grid to realize dual-mode operation of on-grid and off-grid. Background technique [0002] At present, my country's strong and smart grid has entered the stage of comprehensive construction, and will vigorously promote demonstration projects, electric vehicle charging and swapping facilities, new energy acceptance, and residents' smart electricity consumption. As an important part of the smart grid, the micro grid will also be widely used. Microgrid refers to a small power generation and distribution system composed of distributed power sources, energy storage devices, energy conversion devices, related loads and monitoring and protection devices. It is an autonomous system that can realize self-control, protection and management. It can run in parallel with the external power grid, and can also run in isolation. The energy storage and...

AI Technical Summary

Problems solved by technology

However, light and wind energy power sources are intermittent and random and cannot provide a stable voltage source. If a power source is installed in a system that already has an energy storage device, it will not only require additional equipment investment, but also complicate system construction.

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