Implementation of Active Damping Control Methodology on Modular Multilevel Converter(MMC)-Based Arbitrary Wave Shape Generator Used for High Voltage Testing

In order to damp the resonance in the MMC-based Arbitrary Wave shape Generator (AWG) used for high voltage testing, an active damping control methodology is proposed in this paper instead of the passive damping with an arm resistor. It is vital to ensure the system’s stability when such an active damping closed loop control is implemented....

Switch Voltage Rating Selection Considering Cost-Oriented Redundancy and Modularity-based Trade-offs in Modular Multilevel Converter

Modular Multilevel Converters (MMCs) find increasing applications in medium to high-voltage systems. In such systems, reliability-oriented selection of power electronic switches becomes essential because higher modularity implies an increased number of components. The trade-off between the impact of higher modularity on converter reliability...

DC link capacity enhancement for dynamic operation of back-to-back modular multilevel converters

With the increasing appearance of DC loads and DC sources in the MVAC distribution grids, the need for DC power systems is getting more and more pronounced. As a result, the MMC has become a promising and innovative technology that can serve as the interface between a DC and AC network. The MMC-based MVDC distribution link is one of the...

Partial Discharge Behavior of Typical Defects in Power Equipment under Multilevel Staircase Voltage

With the widespread application of power electronic switching technology, power equipment is facing new electrical stresses brought about by multilevel staircase voltages during testing and operation. Therefore, the partial discharge (PD) behavior of five typical defects in power equipment under the staircase waveform needs to be investigated...

Stability Analysis of High-Frequency Interactions Between a Converter and HVDC Grid Resonances

This paper analyzes high-frequency interactions between a Modular Multilevel Converter (MMC) and High Voltage Direct Current (HVDC) grid resonances by studying their effect on the system stability. The recent appearance of converter-related instabilities due to high-frequency oscillations at the converter's ac side raises concerns about whether...

MMC performance evaluation concerning different dc breakers and converters

Renewable energy resources are the most successful, promising, and economical mode of energy generation. Moreover, wind energy is also one of the victorious candidates in generating renewable energy. Currently, High Voltage Direct Current (HVDC) systems are designed to integrate the energy harvested in the Offshore Wind Farms (OWF) to the grid...

Control of MMC-based STATCOM as an effective interface between energy sources and the power grid

This paper presents a dynamic model of modular multilevel converters (MMCs), which are considered as an effective interface between energy sources and the power grid. By improving the converter performance, appropriate reactive power compensation is guaranteed. Modulation indices are calculated based on detailed harmonic evaluations of both...

Modular Multilevel Converter (MMC) based High Voltage Test Source: Demonstration of a proof of concept with a mathematical model and simulation study for arbitrary wave shapes generation

Conventional high voltage test sources, i.e., transformers (cascaded and resonant), impulse generators, and rectifier circuits generate 50 Hz/60 Hz sinusoidal, lightning and switching impulses, and DC respectively. For arbitrary wave shapes, function generator and HV amplifier setup are available up to 50 kV and few kHz signal bandwidths....

Multi-port DC hub based on the Modular Multilevel Converter for Multi-terminal HVDC grids

It is expected that DC grids will evolve into large meshed networks, which will have multiple DC voltage levels. Two DC grids operating at different voltage levels could be interconnected using a DC-DC converter. The role of the DC-DC converter in meshed DC networks is similar to the role of a transformer in traditional AC systems. The DC-DC...

Optimized Control of LCL-VSC Converter With Refined s-Parameter

For the control of high-voltage dc (HVdc) systems, especially for that of the multiterminal HVdc (MTdc) systems, the voltage source converter (VSC) is a good option because of its high controllability. These days, different types of VSC converters have been realized such as the two/three level converter and modular multilevel converter....

Modelling of Modular Multilevel Converters for Fast and Accurate Simulation of Electromagnetic Transient Phenomena in HVDC Applications

Modular multilevel converters (MMC) are gradually becoming the technology of choice in high-voltage direct current (HVDC) power transmission for grid integration of large-scale offshore wind farms and multi-terminal HVDC transmission schemes. Each phase of an MMC HVDC terminal consists of several hundreds of identical submodules that switch a...

Interfacing Multi-Megawatt Large Scale Offshore Wind Turbine with Modular Multilevel Converter

The aim of the master thesis was to investigate the effect of Modular Multilevel Converter (MMC) on wind energy electrical system. In different literature sources MMC is used at the grid side of the turbine. This thesis has a focus on the implementation of the MMC at the generator side of the wind turbine and comparing this new topology with...