This invention introduces a hybrid modular multilevel converter (MMC) designed to enhance voltage management and reliability in power transmission systems. By integrating improved capacitor voltage balancing techniques, it addresses challenges such as circulating currents and semiconductor losses, thereby improving energy efficiency and grid stability across various industrial applications including power generation, renewable energy, electric vehicles, and industrial automation. The new hybrid MMC is much more efficient, wastes less energy, produces cleaner electricity, and is better at dealing with electrical issues, making it a more reliable and robust component for our modern power grids.
Figure (1) New Hybrid Multilevel Converter (a) Schematic of new multilevel converter, (b) wave shaping circuit consisting of series of switching circuits.
The problem addressed by this invention lies in the efficient management of voltage in hybrid modular multilevel converters (MMC). These converters are crucial in various power transmission systems but face challenges like uneven capacitor voltage distribution, limited fault tolerance and circulating current leads to increased semiconductor losses. This invention introduces a method and system that balances capacitor voltages across multiple modules within the converter, ensuring stable operation and enhanced reliability in power transmission applications.
- Integrates hybrid modular multilevel converter (MMC) with improved capacitor voltage balancing.
- Enhances reliability by addressing circulating currents and semiconductor losses.
- Enables efficient voltage management across multiple sub-modules.
- Combines MMC and two-level converter advantages for optimized power transmission.
- The proposed hybrid MMC significantly lowers the harmonic content of the output voltage.
A simulation model of the three-phase HMMC 1000 (and later HMMC 1100) was constructed with defined parameters (e.g., 200 kV DC link voltage, 10 submodules per chain link, 0.8 mF capacitance, 1mH arm inductance, 100 Ω / 100 mH load). The disclosed operational principles, performance metrics like current waveforms, voltage generation, and the effects of modulation index changes, were all verified through these detailed simulations, rather than a physical hardware prototype.
A Hardware prototype has been developed, and all the simulations and hardware studies have been successfully performed.
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Enhanced MMCs can support the development of smarter grids, allowing for better control, monitoring, and flexibility in power distribution. This could pave the way for more resilient and adaptive energy systems. Reduced losses and improved efficiency in power transmission can lead to significant operational cost savings for utility companies, which can, in turn, benefit consumers through more stable electricity prices. Enhances the stability and reliability of power grids, supporting uninterrupted electricity supply to communities.
High Voltage Direct Current (HVDC) Transmission Systems, Flexible Alternating Current Transmission Systems (FACTS), Renewable Energy, Electric Vehicles, Industrial Automation
Geography of IP
Type of IP
213/MUM/2015
422468