Abstract
MMC is a promising technology for MTDC systems and would transform into the concept of Supergrids in the near future. The salient features of MMC are modularity, reduced dv/dt and di/dt stress on switches, voltage and power scalability, inherent fault blocking capacity, transformerless operation, and improved power quality. However, there are some technical issues and challenges to be critically analysed and addressed. There is room for development of novel and enhanced MMC based on SM configurations to enable higher efficiency, improved power quality, compactness, and DC fault blocking capacity. Moreover, development of efficient and accurate models is required for the studies of MTDC grids during steady-state and transient conditions. Literature review suggests a need for studying and comparing different MMC modelling approaches because no modelling technique can be best suited for all applications. The main contribution of this paper is to provide a comprehensive review of recent developments in MMC in terms of SM configurations. This paper also presents an in-depth review of systematic comparison of different models of MMC, which can enable appropriate selection of model based on target studies and desired accuracy and efficiency. Finally, the associated research challenges and future trends are presented.
Highlights
Over the years, there have always been heated disputes between the supporters of the Direct Current (DC) and AC systems [1–3]
Several studies have been conducted to address technical issues and challenges for modular multilevel converter (MMC)-based Multiterminal Direct Current (MTDC) grids. is paper presents a comprehensive review of the recent development of MMC topologies. e other main contribution of this paper is to provide a detailed systematic review of MMC modelling techniques
It must be noted that the dynamics of the HVDC system are totally different due to the presence of DC circuit breakers and converters compared to High Voltage Alternating Current (HVAC)
Summary
Jahangir Badar Soomro , Faheem Akhtar, Rashid Hussain, Jamshed Ahmed Ansari , and Hafiz Mudassir Munir. E salient features of MMC are modularity, reduced dv/dt and di/dt stress on switches, voltage and power scalability, inherent fault blocking capacity, transformerless operation, and improved power quality. Ere is room for development of novel and enhanced MMC based on SM configurations to enable higher efficiency, improved power quality, compactness, and DC fault blocking capacity. Literature review suggests a need for studying and comparing different MMC modelling approaches because no modelling technique can be best suited for all applications. E main contribution of this paper is to provide a comprehensive review of recent developments in MMC in terms of SM configurations. Is paper presents an in-depth review of systematic comparison of different models of MMC, which can enable appropriate selection of model based on target studies and desired accuracy and efficiency. The associated research challenges and future trends are presented
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