Advantages of three-phase photovoltaic grid-connected inverter

Photovoltaic power generation systems are divided into single-phase grid-connected power generation systems and three-phase grid-connected power generation systems. Generally speaking, systems less than 5KW generally use single-phase grid-connected systems, and systems greater than 5KW generally use three-phase grid-connected systems. So, what is the difference between three-phase grid-connected power generation and single-phase grid-connected power generation? What are the advantages?

First of all, we need to understand the difference between single-phase electricity and three-phase electricity, and the advantages of three-phase electricity over single-phase electricity.

1. 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 induction motors, which have a simple structure, are easy to maintain and manufacture, and are durable. They have important uses in industry, so industrial electricity is generally three-phase electricity. Secondly, the use of three-phase electricity provides more voltage options, because three-phase electricity can be connected to single-phase electricity, but single-phase electricity cannot be connected to three-phase electricity. ?

2. From a safety perspective, three-phase electricity can provide a better voltage level and is relatively safe. Assuming the voltage is 380V, if it is single-phase, one wire is 380V and one wire is 0V. However, if it is three-phase, both wires are 220V. The decrease in voltage level has advantages in insulation, wire diameter and a series of safety issues.

3. From a physical point of view, the single-phase instantaneous power curve is undulating and not stable enough, while the instantaneous power of the three-phase motor is a straight line, equivalent to the average power, which is relatively stable. Furthermore, because the three phases of the three-phase potential are 123 degrees apart from each other, for this reason, 4 wires can transmit 3 times the single-phase power.

4. From an economic perspective, for enterprises, the higher the voltage used, the cheaper the electricity bill. For Guijia, if it is single-phase power generation, the country still needs to build transmission towers and dig cable trenches, and the cost is similar to three-phase transmission, but the efficiency of three-phase transmission is much higher. At the same cost, the transmission capacity of three-phase electricity is stronger than that of single-phase.

Three-phase grid-connected power generation refers to the three-phase grid connected to the inverter, and single-phase grid-connected power generation refers to the inverter connected to the single-phase grid. The three-phase grid-connected power generation system has a wide range of applications, high inverter power density, good output power quality, small impact of three-phase balance on the grid, light grid burden, and high power utilization. It will be increasingly used in power generation systems in various occasions.

To this end, Nanjing Yanxu, as a professional photovoltaic grid-connected inverter supplier, has launched a new series of small-power three-phase photovoltaic grid-connected inverters, providing new, intelligent new concept solutions for household grid-connected systems.

Features of Yanxu three-phase grid-connected inverter:

1. Wider application range: Yanxu three-phase photovoltaic grid-connected inverter not only provides intelligent solutions for household roofs, but can also be used in small industrial and commercial power stations, giving users more choices.

2. High power density: Since the output voltage of the three-phase inverter is high, the current is relatively low at the same power, so the loss of internal devices is relatively small, and the volume can be smaller at the same power.

3. The output power quality is high and the impact on the grid voltage is small. The output current is smaller than that of a single-phase input current, and the output cable from the machine to the grid is consistent. When the line resistance is consistent, the voltage drop on the cable is small, which has little impact on the grid voltage and will not increase the grid voltage much.

Product advantages: high conversion efficiency

Automatic MPPT (Maximum Power Point Tracking)

Embedded LCD display, can display complete status information?

Compact, small size

Multiple MPPT technologies, multiple series and parallel connections?

High reliability

Easy installation and maintenance-free

Standard model RS485 (WIFI? Wireless optional according to remote communication requirements)

Yanxu's three-phase photovoltaic grid-connected inverter is equipped with an operation and display human interaction interface, which can be used for maintenance and users to view real-time or historical operation information and product fault information.