More than a simple multilevel inverter
truly modular converters
The Modular Multilevel Converter test bench is constructed in a modular fashion, the same way as larger power converters from this family.
Both the power and the control stages are built using standardized identical elements. Notably, the Modular Multilevel Converter cells – or submodules – can be freely selected among the list of available imperix power modules.
Thanks to this high degree of modularity, various types of multilevel inverters can be easily built. Research engineers only need to rearrange the submodules and their wiring.
On the control side, the three units of the B-Box RCP prototyping controller offer various possible configurations, ranging from entirely centralized control to hierarchized and distributed control implementations.
Finally, when not used as part of a Modular Multilevel Converter mock-up, all products – control and power sides – can be also implemented to form more conventional power converter topologies.
DEFAULT MMC CONFIGURATION
- 3x controller units
- 24x half-bridges submodules
3x B-Box RCP
3x Open rack
24x MMC submodules
1x 19” cabinet
A Modular Multilevel Converter at the laboratory size
Our ready-to-use Modular Multilevel Converter is designed for operation on the 230/400 VAC domestic grid voltage. This makes it an accessible downsized variant of the high-voltage industrial converters. Its structure and operation are identical to those dedicated to high-voltage DC transmission systems (HVDC), except the reduced power ratings.
MODULAR CONTROL HARDWARE
Imperix controllers can be very easily stacked, thanks to a Gigabit optical fiber connection. Up to 64 units can be directly interconnected.
MODULAR POWER HARDWARE
Different types of MMC submodules are available, including full-bridge, half-bridge and NPC-type configurations.
The submodules can be mounted within 19” rack-mountable frames, so that their connections can be re-arranged when needed.
Configurable number of MMC submodules
SCALABLE Modular Multilevel converters
Scalability is the essence of Modular Multilevel Converters. Therefore, the MMC test bench is scalable too!
The default configuration contains three control units and 24 submodules, however other variants are of course possible. The only constraints are that the number of PWM and analog I/O must match, plus that the maximum DC bus voltage remains below 1kV. From there, engineers can build up the system of their dreams.
Default Modular Multilevel Converter configuration
- Number of submodules per arm: N = 4
- Number of l-l voltage levels: max 17 levels
- Maximum DC voltage per submodule: Vsm = 200V
- Total DC bus voltage: VDC,max = 800V