Similarities and differences between microgrids and off-grid systems

Both microgrid and off-grid photovoltaic power generation systems have certain similarities to a large extent, but the two are not exactly the same, and there are many problems that should be paid attention to in the actual aspects. The following is a brief analysis of the two cities. In order to facilitate understanding of the application.
A microgrid
The microgrid system is a new type of network structure. It is a system unit composed of distributed power sources, loads, energy storage systems, and control devices. It is an autonomous system that can realize self-control, protection and management, and can be connected to the external power grid. Running, it can also be run in isolation.
The microgrid system is a concept relative to the traditional large-scale power grid system and refers to a network in which a plurality of distributed power supplies and their related loads are formed according to a certain topology, and is connected to a conventional large power grid through a switch.
The core equipment in the microgrid system is the distributed power supply and energy storage system, including photovoltaic grid-connected inverters, wind power grid-connected inverters, diesel engines, PCS, and BMS.
In recent years, with the rapid development of microgrid systems, grid-connected inverters have been given a new definition: distributed photovoltaic power. It can be used as the main power supply of the microgrid system and it is one of the core technologies of the entire microgrid system. Because of the special nature of the power supply (current source), it can also be used as a supplemental power supply for the microgrid system.
PCS, or energy conversion system, is a new type of distributed power supply with very flexible applications and powerful functions. It is also a kind of energy storage system. As a four-quadrant converter, it can implement both grid-connected inverter functions and grid-connected rectifier charging functions, and it can also realize independent off-grid inverter functions.
In the microgrid system, the distributed configuration of the distributed power supply is based on certain principles. Otherwise, it will cause excessive power supply or lack of power supply.

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