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Design considerations and performance evaluation of hybrid DC circuit breakers for HVDC grids
(2016)2016 18th European Conference on Power Electronics and Applications (EPE'16 ECCE Europe)Conference Paper -
Unidirectional hybrid circuit breaker topologies for multi-line nodes in HVDC grids
(2016)2016 18th European Conference on Power Electronics and Applications (EPE'16 ECCE Europe)Conference Paper -
Hybrid Circuit Breaker for HVDC Grids with Controllable Pulse Current Shape
(2017)2017 19th European Conference on Power Electronics and Applications (EPE'17 ECCE Europe)Conference Paper -
Design Procedure and Control of a Hybrid Circuit Breaker with Adaptable Pulse Current Injection
(2018)2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia)Conference Paper -
Modelling and Design of a Medium Frequency Transformer for High Power DC-DC Converters
(2018)2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia)Conference Paper -
High Output Voltage Precision PWM for Modular Multilevel Converters
(2017)2017 19th European Conference on Power Electronics and Applications (EPE'17 ECCE Europe)Recently, modular multilevel conterters (MMC) are also considered for medium voltage (MV) applications, where the number of modules and the switching frequency are relatively low compared to high voltage (HV) applications. In this context, standard modulation methods can cause relatively large output voltage errors. This effect is amplified even more, if the value of the module capacitances is decreased to reduce cost and volume of the ...Conference Paper -
Long Horizon, Quadratic Programming Based Model Predictive Control (MPC) for Grid Connected Modular Multilevel Converters (MMC)
(2019)IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics SocietyExcellent control performance is a prerequisite to operate compact modular multilevel converter (MMC) designs that employ very small module capacitance values. This paper presents a novel model predictive control (MPC) scheme featuring a linear and accurate prediction model to overcome the drawbacks of comparable control schemes. The MPC is based on a modulator that determines the switching states of the individual modules to guarantee ...Conference Paper -
Impact of the Prediction Error on the Performance of Model Predictive Controllers with Long Prediction Horizons for Modular Multilevel Converters - Linear vs. Nonlinear System Models
(2018)2018 20th European Conference on Power Electronics and Applications (EPE'18 ECCE Europe)The closed loop control performance of MMCs can be significantly improved by using Model Predictive Control (MPC). This paper evaluates an MPC algorithm based on a linearised MMC model regarding the performance limits caused by the prediction error due to the linearisation. To decrease the prediction error to a minimum and to improve the performance it is proposed to use a nonlinear MMC model as a prediction model for the MPC. The steady ...Conference Paper -
Output Voltage Stability of Series Connected Transformers for Isolated Auxiliary Supplies in Modular Medium Voltage Converter Systems
(2018)2018 20th European Conference on Power Electronics and Applications (EPE'18 ECCE Europe)A common way of implementing MV insulated gate and/or auxiliary power supplies for modular converters is using series connected transformers in an LLC resonant converter topology. The LLC converter can result in output voltage instabilities for differing constant power loads at the outputs when operated at resonance frequency. To balance the output voltages, a new balancing concept based on a coupling between the individual transformers ...Conference Paper -
Analysis of PCB embedded power semiconductors for a 30 kW boost PFC converter
(2016)2016 18th European Conference on Power Electronics and Applications (EPE'16 ECCE Europe)Packages of power semiconductors have considerable influence regarding the thermal impedance, the parasitic inductance, which affects the switching losses, and the reliability. In this paper, the performance of a phase leg of a PFC rectifier with PCB embedded power semiconductors is investigated. The mechanical stress in the PCB is analyzed by a FEM simulation and PCB design guidelines are given. The thermal impedance, parasitic inductance ...Conference Paper