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The solar photovoltaic power generation system mainly consists of battery panels, charge controllers, inverters, and batteries. The solar inverter is a power conversion device and can be classified into self-excited oscillation inverters and externally excited oscillation inverters based on the excitation method. Since the voltage output of solar energy is generally 12V, 24V, or 48V, to increase the voltage amplitude and to provide power to 220V appliances, it is necessary to convert the direct current produced by the solar power generation system into alternating current. To achieve such a significant voltage increase, an inverter is essential.
The inverter of the solar power generation system mainly consists of the main circuit and the control system and can be classified into the following types based on different characteristics:
1. According to the characteristics of the output alternating current voltage, it can be divided into four types: constant frequency constant voltage sine wave inverters, constant frequency constant voltage square wave inverters, variable frequency variable voltage inverters, and high-frequency pulse voltage inverters.
2. Based on the different structures of the inverter circuit, it can be divided into four types: single-phase half-bridge inverters, single-phase full-bridge inverters, push-pull inverters, and three-phase bridge inverters.
3. According to the type of direct current power source, it can be divided into two types: voltage-type inverters and current-type inverters.
4. Depending on the different switching devices and their switching methods, it can be classified into two types: self-commutated hybrid inverters using fully controlled switches and forced commutated thyristor inverters using thyristors.
Nowadays, many solar photovoltaic inverters on the market use self-commutated hybrid inverters with fully controlled switches. Manufacturers recommend using GTOs for high power, IGBTs for medium power, and PMOSFETs for low power. However, due to the variety of buildings, the solar photovoltaic array devices also vary. Therefore, in order to ensure high conversion efficiency of solar energy while considering the aesthetic appearance of buildings, the inverter must also be diversified to achieve various ways of solar energy conversion.
Solar manufacturers specialize in the research, development, production, and sales of solar street light products and the design of household solar photovoltaic power generation systems.
