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Comparison of Microgrid System and Off Grid PV Power Generation System

Sep 01, 2020


The micro-grid power system is a new type of network structure. It is a system unit composed of distributed power supply, load, energy storage system, and control device. It is an autonomous system that can realize self-control, protection, and management, and can run in parallel with the external power grid or in isolation.

Off-grid system

Off-grid photovoltaic power generation system, also known as an independent photovoltaic power generation system, is mainly composed of PV components, DC/DC charging controller, off-grid inverter, and load, with independent power supply and independent energy storage functions.

Off-grid photovoltaic power generation systems are mostly used in areas far away from large power grids, such as the Gobi, beaches, islands, and other areas.

Micro-Grid Power System

Comparison of the microgrid system and off-grid photovoltaic power generation system

1. Commonness

All have independent power supply characteristics;

All need energy storage system;

Both need to match the best capacity for the battery.

2. The difference

The microgrid system is an active system and can be connected to the large grid, and the off-grid photovoltaic power generation system is a passive system and cannot be connected to the large grid;

The microgrid system is more complex, and there are more distributed power sources that need to be configured. Off-grid photovoltaic power generation systems only need controllers and off-grid inverters;

The energy storage system in the microgrid system is a four-quadrant converter, which can realize two-way energy flow, and the energy storage system in an off-grid photovoltaic power generation system is a single-phase converter, which cannot achieve two-way energy flow.

3. Practical application principles

If the application is in remote areas such as Gobi and beaches that do not require frequent manual maintenance, the off-grid photovoltaic power generation system is appropriate. Therefore, this system does not need to be manned and can operate independently, and only requires regular maintenance of the battery.

If the application is close to a large power grid, which requires frequent maintenance and strict dispatching requirements, it is advisable to use a microgrid system, because the switching and dispatching of various distributed power supplies and the operation state of such a system all require human intervention, and some even require monitoring system.

The information is provided by hybrid grid system design company.