Photovoltaic power generation systems are divided into single-phase grid-connected power generation systems and three-phase grid-connected power generation systems. In the first two years, systems less than 5KW generally used single-phase grid-connection. Reduced the installation cost of household photovoltaic power stations. So, what is the difference between three-phase grid-connected power generation and single-phase grid-connected power generation? what are the benefits?
I. From the perspective of use
Three-phase power has high voltage and can drive high-power appliances. For example, three-phase power can drive squirrel-cage asynchronous motors. This click structure is simple, easy to maintain and manufacture, and durable. It has important uses in industry, so industrial power Generally three-phase electricity. Secondly, the use of three-phase power will have more voltage options, because three-phase power can be connected to single-phase power, while single-phase power cannot be connected to three-phase power.
2. From a security perspective
Three-phase power provides a better voltage level and is relatively safe. Assuming a voltage of 380V, a single phase of 380V, and a line of 0V, but if three phases and two lines of 220V, the voltage level drops, insulation, wire diameter and a series of safety issues There are advantages.
3. From a physics perspective
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 phases of the three-phase power have a single mutual power that differs by 123 degrees, so the four lines can transmit three times the single-phase power.
4. From an economic perspective
For businesses, the higher the voltage, the cheaper the electricity bill. For the country, if it is single-phase power generation, building the same transmission tower and digging the same cable trenches nationwide will cost the same as three-phase power transmission, but the three-phase power transmission efficiency is very high, and the three-phase power transmission capacity is stronger than the single-phase power transmission at the same cost phase.
Three-phase grid-connected power generation is a three-phase grid connected by an inverter. Single-phase grid-connected power generation is a single-phase grid-connected power generation. Three-phase grid-connected power systems are widely used, inverters have high power density, good output power quality, and three-phase balance has a small impact on the power grid. The power grid has a light load and high power utilization rate. It will be increasingly used in power generation systems.