What are the advantages of three-phase grid-connected photovoltaic inverters?

Photovoltaic power generation systems are divided into single-phase grid-connected power generation systems and three-phase grid-connected power generation systems. In the past two years, systems with less than 5KW generally adopted single-phase grid connection. Since last year, inverters with a maximum single-phase power of up to 10kW have been successively launched, greatly reducing the installation cost of household photovoltaic power stations. So, what’s the difference between three-phase grid-connected power generation and single-phase grid-connected power generation? What are the benefits?
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First of all, it is necessary to understand the difference between single-phase electricity and three-phase electricity. Three-phase electricity has the advantage over single-phase electricity.
1. Considering from the perspective of use

Three-phase electricity has a higher voltage and can drive high-power electrical appliances. For example, three-phase electricity can drive squirrel-cage asynchronous motors. This kind of motor has a simple structure, is convenient for maintenance and manufacturing, and is durable. It has important uses in industry. Therefore, industrial electricity is generally three-phase electricity. Secondly, the use of three-phase electricity will have more voltage options because three-phase electricity can be connected to single-phase electricity, while single-phase electricity cannot be connected to three-phase electricity.

2. Considering from the perspective of safety
Three-phase electricity can provide a better voltage level and is relatively safe. Assuming the voltage is 380V and single-phase is 380V with the line at 0V. But if it is three-phase, the two lines are 220V. The voltage level drops, and it has advantages in insulation, wire diameter and a series of safety issues.
3. Considering from the perspective of physics

The single-phase instantaneous power curve fluctuates and is unstable. The instantaneous power of a three-phase motor is a straight line, which is equivalent to the average power and is relatively stable. Contributors, because the three-phase power is the single-phase mutual power with three phases differing by 123 degrees, so four wires can transmit three times the single-phase power.

4. Considering from an economic perspective

For enterprises, the higher the voltage, the cheaper the electricity bill. For the country, if it is single-phase power generation, building the same transmission towers and digging the same cable trenches across the country have the same cost as three-phase transmission. However, three-phase transmission is very efficient. Under the same cost, the transmission capacity of three-phase power is stronger than that of single-phase power.

Three-phase grid-connected power generation is a three-phase power grid connected by an inverter. Single-phase grid-connected power generation is single-phase grid-connected power generation. The three-phase grid-connected power system is widely used. The inverter has high power density, good output power quality, little impact on the power grid due to three-phase balance, light grid load, and high power utilization rate. It will be increasingly applied in power generation systems.

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