Installing grid-tied solar power

Mục lục

What is a grid-tied solar power system?

Grid-tied (grid-connected) solar power system is a solar power solution that works in combination between the solar power system and the national grid power system. Energy from the solar power system will be used before the national grid system.

Where is it suitable to install grid-tied solar power?

A suitable place to install grid-tied solar power must ensure 2 factors:

There is a national grid system to connect to the grid.
Have an average or higher amount of solar radiation, the higher the better.

Based on the above two factors, we analyze together. Geographically, Vietnam is a country with the highest amount of solar radiation in the entire territory of the world. It is a natural geographical advantage for Vietnam when developing a solar power system. In addition, the national grid system operated by EVN has been popularized to nearly 100% of households in the entire territory of Vietnam. So all households, businesses, buildings, offices, factories, factories, schools, hospitals, supermarkets, commercial centers, railway stations, airports... are suitable for solar power installation. grid tie.

Advantages of grid-tied solar power system

Factors to ensure the quality of grid-tied solar power system:

Selection of equipment, components and accessories for system installation must be of high quality and safety. It helps the long-term system operation and reduces energy loss.
The grid-tied solar power system needs a scientific design and construction unit to optimize the system's performance and capacity.
The process of operating, repairing and maintaining the system is easy and convenient.
The quality control parameters of grid-tied solar power sources are within the allowable limits of EVN.
Ensure the structure and aesthetics of the project when installing grid-connected solar power.

Structure of grid-tied solar power system

There are two types of grid-tied solar power systems:

Grid-tied solar power system does not store.
Grid connected solar power system with storage.

Each type will have its own advantages, suitable for different purposes of using solar power. You can choose the solution that best suits your needs. Solar power ensures stability, saves costs and optimizes investment for customers' needs.

Grid-tied solar power system without storage

Main structure of grid-tied solar power system without storage:

Solar panels (solar panels)
Power converter DC-AC Inverter to the grid.
2-way electricity meter (measures the amount of electricity consumed from the national grid and excess solar power generated to the national grid)

Working principle:
Then through a grid-tied converter (DC/AC inverter). The electric current is converted into AC, with the same phase, frequency, and amplitude as the national grid. The system will mix with the national grid to provide electricity for electrical equipment.

When the grid-tied capacity is equal to the load capacity (Loads), the load consumes electricity entirely from the solar cell.
If the consumed power is greater than the grid-connected capacity, the load will take up more grid power to compensate.
When the consumed load capacity is less than the grid-tied capacity, electricity from the grid-tie will be generated to the grid. This amount of electricity returned to the grid will be purchased by EVN according to the official letter of the Prime Minister on encouraging the development of solar power projects in Vietnam. If customers do not use up, they can sell it back to the government, while optimizing costs and making profits right away.

Grid-tie solar power system with storage

The storage system is similar to the non-storage grid connected power system. However, there is an additional battery storage system. For important equipment that needs a stable and continuous power source such as CCTV, alarms, fire alarms, internet, computers, etc. or for the full system load (for special requirements only). Main structure of grid connected solar power system with storage:

Solar panels (solar panels).
Power converter DC-AC Inverter to the grid.
Storage battery system.
Two-way electric meter.

Working principle:
The system will always check the battery condition to make sure the battery is always full. When the battery is fully charged, the current will be transferred to the grid to reduce power consumption. Grid-connected solar power uses all priority loads and normal loads. When there is a power outage in the national grid, the switchgear (ATS) will switch to use the priority load from the electricity stored in the battery. At this time, the entire solar battery system is transferred to the battery charger. When power is restored, the system will switch to normal grid connection.