This patent describes a new type of power converter, called a Multiport Modular Multilevel Converter (MMMC), which acts like a versatile hub for electricity. Imagine needing to connect several different power sources (like various DC power lines) to different power users (like AC power grids or other DC lines) all at once, especially at high power levels. Normally, you'd need many separate, complex machines for this. This invention simplifies that by introducing a single, flexible converter. Its key innovation is that its internal "arms" (the main building blocks of the converter) can be split into smaller "sub-arms." This smart design allows the MMMC to efficiently connect multiple DC power sources of different voltages to one or more AC power grids, or even to other DC systems. It's highly adaptable, meaning it can be scaled up or down and configured in different ways to suit various power needs. In short, it makes connecting diverse power sources and loads much more efficient, less complicated, and potentially more affordable than current methods.
Figure (1) (a) Multiport Multilevel converter 1 (MPMC1) and (b) Multiport Multilevel converter 2 (MPMC2); Multiport Multilevel converter 3 (MPMC3)
High voltage direct current (HVDC) and medium voltage direct current (MVDC) transmission systems require multiple converter topologies to interlink various voltage buses. This current approach is not economical or compact, especially in applications needing both AC and DC voltage buses, like electrical ships. At lower power levels, existing multiport converters are limited to DC sources and lower power ratings, creating inefficiencies and a lack of scalability for higher power applications.
- Interconnection Capability: The converter can interconnect multiple DC sources and AC sources, making it suitable for complex power systems.
- Modular Design: The modular structure allows for easy scalability to various voltage levels, ensuring flexibility in application.
- Reduced Footprint: The design reduces the overall footprint of the converter compared to traditional topologies, making it more economical and compact.
- High Efficiency: The converter operates with high efficiency, which is crucial for reducing energy losses in high voltage applications.
- Fault Tolerant: The converter's design includes fault-tolerant capabilities, enhancing system reliability.
- Superior Harmonic Performance: The use of multiple sub-arms in each leg improves the quality of the AC waveform, which is essential for maintaining power quality.
The patent emphasizes the theoretical framework, voltage expressions, and various possible topologies for the MMMC.
A Hardware prototype has been developed, and all the simulations and hardware studies have been successfully performed.
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By facilitating the integration of diverse power sources and loads with different voltage requirements, it paves the way for more robust and resilient smart grids. Imagine a future where offshore wind farms (HVDC) can seamlessly power coastal cities (HVAC) while simultaneously charging large battery energy storage systems (MVDC) and providing power to local industries.
HVDC, Drives, FACTS, Power Electronics, Transmission Systems, Distribution Systems, Microgrid, MVDC, Renewable Energy Integration, Interconnections between Grids.
Geography of IP
Type of IP
201941022930
504445