DC power generation system does not include inverter. Inverter is a power conversion device, inverter by excitation can be divided into self-excited oscillation inverter and his excited oscillation inverter. The main function is to reverse the battery DC into AC. Through the full-bridge circuit, the SPWM processor is generally used for system end-users after being modulated, filtered, boosted and so on to obtain a sinusoidal AC power matching the lighting load frequency and rated voltage. With an inverter, you can use a DC battery to provide AC power to the appliance.
Due to the diversity of buildings, solar panels will inevitably lead to the diversity of installation, in order to maximize solar conversion efficiency while taking into account the aesthetic appearance of the building, which requires diversification of our inverter to achieve the best way of solar energy Conversion.
Focus on inversion
Inverted In general, with large PV power plants (> 10kW), many PV strings connected in parallel are connected to the DC input of the same centralized inverter. Generally, three-phase IGBT power modules are used, The smaller power field effect transistors, along with the DSP conversion controller to improve the quality of the output power, make it very close to the sine wave current. The most important feature is the system's high power, low cost.
String inverters have become the most popular inverter in the international market. The string inverters are based on a modular concept. Each PV string (1kW-5kW) passes through an inverter with maximum power peak tracking at the DC side and is connected in parallel on the AC side. Many large-scale photovoltaic power plants Use string inverters.
Multi-string inverter is taken concentrated in the inverter and string inverter advantages, to avoid its shortcomings, can be applied to a few kilowatts of photovoltaic power plants. In multi-string inverters, there are separate power peak-tracking and DC-to-DC converters, which are converted to AC power by an ordinary DC-to-AC inverter and networked to the grid.
Component Inverter is to connect each PV module to an inverter with a separate maximum power peak tracking for each component so that the components work better with the inverter. Typically used for 50W to 400W photovoltaic power plants, the overall efficiency is lower than the string inverter.
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