Central inverter solutions
Central inverters convert power on multiple strings of connected solar panels. They are rated from around 600 kW to 3000 kW. Central inverters typically rely on single-stage power conversion and the majority of inverter designs are transformer-based or isolated. In the DC-AC stage, variable DC is converted to grid-compatible AC power.
Two-level or three-level NPC1 / NPC2 / ANPC topologies are preferred in this stage. A three-level topology is widely used as it enables higher efficiency levels. A three-level NPC2 topology is usually the preferred choice for 1000 V photovoltaic (PV) systems. 1500 V PV systems are becoming more popular as they can reduce system costs and improve end-to-end efficiency. Three-level NPC1 / ANPC topologies enable more robust inverter designs that are more resistant to cosmic radiation. Switching frequency and cooling requirements are key factors that influence the size of the AC filter, volume of the system and costs. Power modules that offer low losses and high current densities are desirable.
Infineon offerings for designs up to 1000 kW
System design challenges for central inverters
Manufacturers are continually looking to improve system costs and performance levels. As a result, inverter power capacities are gradually rising. This has led to a clear trend towards 1500 V photovoltaic arrays in utility-scale installations.
Thanks to our broad portfolio of power semiconductors and our expertise in leading technologies such as silicon (Si), silicon carbide (SiC) and gallium nitride (GaN), we can customize chip technology and packaging, offering you the perfect solution for your PV inverters.
New white paper: Trends and solutions in Solar, Wind and Energy Storage Systems
Learn about the application and power semiconductor requirements for solar, wind, and energy storage systems. Understand how Infineon responds to the trends in the market of renewable energies and storage systems, e.g., inverter integration with CoolSiC™ MOSFETs. Get an overview of different solution offerings for solar, wind, and energy storage systems.
Application presentation: Exploiting the unlimited potential of Solar energy
This presentation gives you an overview of topologies, technological trends, and requirements of solar applications. Find out more about our offering for each inverter type – from the microinverter to the central and string inverter. Check our recommendations for your application, and you get your customized module in a five-month timeframe.
On-demand webinar: From solar and wind to energy storage
In the webinar, you will gain insight into renewables and the emerging applications of energy storage. Learn more about application trends and requirements, and understand Infineon's solution offerings for these applications.
Let’s learn more about how solar inverters work, from the ones we have in our houses, to the ones that are applied in major factories. We will also see how Infineon innovates in power semiconductors for solar inverter technology and how that can help with reducing costs and time to market.