Comparison of Total Harmonic Distortion of Modular Multilevel Converter and Parallel Hybrid Modular Multilevel Converter

Voltage Sourced Converters (VSC) are being used in High Voltage Direct Current (HVDC) power transmission to convert electrical power from AC to DC and vice versa and has the significant proportion of future DC transmission schemes. The converters have the ability to provide the connected AC networks with “clean” real and reactive power without the need for large passive harmonic filters, makes them attractive for many applications where plant size and weight are important. PHMMC and MMC both are the types of voltage source converter. Both, PHMMC and MMC are considered as the promising multilevel converter topologies especially in high voltage applications such as HVDC transmission system. Compared with the MMC, the Parallel hybrid MMCs can potentially reduce the ratings of the converter components and power losses. This paper discusses the comparison of the performance of 9 level PHMMC and 4 level MMC, showing the number of device count reduced in the PHMMC along with the simulation model of the PHMMC and MMC.