Power Conversion Systems
With the enormous amount of energy being consumed in today's world and government policies to minimize carbon emissions, the shift to renewable energy makes reliably delivering energy where and when it is needed more challenging than ever. As a result, demand for energy storage systems is also on the rise. A critical component of any successful energy storage system is the power conversion system (PCS). The PCS is the intermediary device between the storage element, typically large banks of (DC) batteries, and the (AC) power grid.
AC/DC and DC/AC conversion takes place in the power conversion system (PCS). The energy flows into the batteries to charge them or is converted to AC from the battery storage and fed into the grid. In PCS, solutions below 30 kW are typically best served with discrete solutions such as, OptiMOS™, CoolMOS™, and CoolSiC™ MOSFETs as well as CoolGaN™ for more advanced, fast switching designs, while above 100 kW the modular approach CoolSiC™ and IGBTs modules and highly integrated 3-level Easy modules make the most economic sense.
The range in between is best examined on a case-by-case basis to determine the use of discrete or module solutions. Since every switch needs a driver, and every driver needs to be controlled, we offer the appropriate EiceDRIVER™ gate driver ICs as well as XMC™ and current sensor solutions. OPTIGA™ products round off the range and ensure data protection and security.
Energy storage systems with power below 10 kW are usually used in residential areas and homes. The systems are commonly applying two stages that need to operate in bi-directional mode: DCDC and ACDC stage.
Infineon enables full system solutions with the highest efficiency and power density by applying market-leading Silicon Carbide (SiC) and Silicon (Si) MOSFETS as well as IGBT technologies paired with best-fit gate drivers.
- Battery voltage <1000 V: CoolSiC™ module 1200 V half-bridge (2-level), Easy CoolSiC™ 3-level (3-level NPC2)
- Battery voltage 1200 V, 1300V: 1700 V half-bridge module, 3-level ANPC module
- Battery voltage <1000 V: CoolSiC™ module 1200 V
- Battery voltage 1000 V 3-level NPC1: 62mm, EconoDUAL™ 3
- Battery voltage 1500 V, 3-level ANPC: Easy 3B, 62mm, EconoDUAL™ 3, PrimePACK™ 3, PrimePACK™ 3+
- Battery voltage 1500 V, 3-level NPC2: PrimePACK™ 3+
Having battery packs with a different state of charge (SOC) connected in series, this system is only able to operate until one pack reaches the minimum allowable charge level. At this point, the whole system is shutting down, even though other packs may still be sufficiently charged. In short, battery utilization is limited to the weakest battery pack.
To overcome this limitation, modularly cascaded, multilevel architectures have been developed that utilize the benefit of highly efficient, low-voltage MOSFETs such as Infineon's market-leading OPTIMOS™ family. Each battery pack is connected to its own directional power converter and the outputs of these converters are then connected in series to create the high voltage DC-bus.
By doing so, an equal current can be supplied from the outputs of each of these stages. With this added flexibility it is now possible for advance control schemes to balance the SOC of different batteries among all the packs by placing a heavier load on those packs with higher SOC, i.e. BMS functionality is a feature that additionally comes along with this solution.
Low Voltage MOSFET (<300V): OPTIMOS™
Gate Driver IC: EiceDriver™
- IPOSIM (High Power Modules & Disk Devices)
- Discrete IGBT Simulator
- Power Supply Simulation Tool
- XENSIV™ - Magnetic Sensors Simulation Tools
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