The modular multilevel converters (MMCs) are widely used in different applications in recent years. Due to lowloss operation, compactness and high modularity, MMC is greatly attractive for high voltage direct current (HVDC) applications. The HVDC station costs and losses are highly related to the switching frequency, capacitor voltage ripple and power quality; which are influenced by modulation...

In the field of power electronics applications, advances in high voltage semiconductor devices have led specifically over the past few decades to tremendous improvements in terms of power handling capability and control. We focus in this paper on the recent developments with regard to optimizing the power semiconductor for the solid state HVDC breaker for HVDC grid applications. One of the trad...

High-voltage dc transmission based on voltage-source converter (VSC-HVdc) is quickly increasing its power rating, and it can be the most appropriate link for the connection of offshore wind farms (OWFs) to the grid in many locations. This paper presents a steady-state operation model to calculate the optimal power transmission of an OWF connected to the grid through a VSC-HVdc link. The wind tu...

AC-HVDC-AC energy conversion systems using modular multilevel voltage-source converters (MMC) are becoming very popular to integrate distributed energy systems to the main grid. MMC AC-DC-AC converters are also being considered for large HVDC transmissions systems. Such multi-level converters pose a serious problem for HIL simulators required for control, protection design and testing due to th...

In the field of power electronics applications, advances in high voltage semiconductor devices have led specifically over the past few decades to tremendous improvements in terms of power handling capability and control. We focus in this paper on the recent developments with regard to optimizing the power semiconductor for the solid state HVDC breaker for HVDC grid applications. One of the trad...

With the development of large-scale new energy, wind–thermal bundled system transmitted via high-voltage direct current (HVDC) has become main method to solve problem wind power consumption. At same time, subsynchronous oscillation among generators, (HVDC), and synchronous generators (SGs) increasingly prominent. According dynamic interaction doubly fed induction (DFIGs), HVDC, SGs, a lineariza...

The cellulosic material pressboard is a key component in insulation systems for HVDC (high-voltage direct current) equipment. Pressboard compounds are considered from a chemical point of view in order to link it in a subsequent study with electric conduction processes in pressboard. For a better understanding of pressboard, its manufacturing is described and fiber geometry is evaluated by SEM (...

The principle of the traveling wave based differential protection for bipolar HVDC transmission lines is proposed in the paper. Unlike the traditional current differential protection, the quantity of current is replaced by the quantity of the traveling wave for comparison. The traveling wave at the remote end is transferred to the local end for comparison to the local traveling wave. For the bi...