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DesIgn a HVDC MW-level MMC converter for electrolysers


Scope:

To study and design the upscaling of a MMC power converter for high-voltage DC-connection instead of medium-voltage DC-connection. The designed power converter will be used to power a low-voltage high-current electrolyser.

Problem definition:

Vonk is leading manufacturer and system integrator of the power converters. Vonk along with other industrial partners is investing in upscaling of the green hydrogen generation in which the available energy from solar or wind is converted to feed the electrolyser with the desired power quality.

A MW-level, state-of-the-art MMC based converter topology is proposed (and designed) by Vonk as an interface between a MVDC grid and LVDC electrolyser. The student shall design a MW-level converter topology to connect a HVDC grid (e.g., 80 kV) to the LVDC (e.g., 600 V) electrolyser. The focus will be on the design principles for HVDC and the design criteria for e.g., a HVDC MMC sub-module, voltage and current measurements and which semiconductor can be used in such a sub-module.

Methodology:

·         Literature study about HV converters, HV power switches, possible potential hazards

·   Enhance existing MATLAB/Simulink simulation to Design/Specify every component from the proposed topology: e.g., MMC sub-module, transformers, filters, various measurements, and their interfacing with Vonk control platform, etc.

·         Implement and verify some design principles of for instance a voltage measurement, current measurement or MMC sub-module in a high voltage laboratory.

Research Objectives:

·         Determine requirements for design of a HVDC converter for a MW-level electrolyser system

·         Specifications of main components of a HVDC converter.

·         Proof of concept for voltage and current measurement at high voltage.

Contact details:

·         Company Supervisor: Mahesh Itraj

·         Company HR Business Partner: Annemieke Moes-Teeuwen 📞 06 55 08 50 81

Design and test an optimal control strategy for a MVDC MM


Scope:

To study and implement the control system for a Multilevel Modular Converter (MMC) for medium voltage DC grid integration of a high current electrolyser power supply.

Problem definition:

Vonk is leading manufacturer and system integrator of the power supplies which converts the available energy from any renewable energy source to feed the electrolyser with the desired power quality. Vonk along with other industrial partners is investing in upscaling of the green hydrogen generation.  One of the crucial parts in the system is the power supply with which these electrolysers are powered. A MMC based power supply topology is proposed as an interface between a MVDC or HVDC grid and LVDC electrolyser. The student shall design and integrate the control loops for the MMC on the available small, scaled prototype or test bench.

Methodology:

·         Literature review will be done to find the best control strategy.

·         Simulations in MATLAB Simulink, concerning:

o   Voltage and current loops.

o   Submodule capacitor balancing loop.

o   Circulating current reduction loop.

o   Active filtering control loop.

·         Measurement and Protection loops.

·         Implementation of control loops in a scaled prototype.

Research Objectives:

·         Determination optimal switching techniques for MMC and required control loops.

·         Derivation of control loop parameter.

·         Realisation of Control loops for the scaled prototype

·         Effect of upscaling on control system parameters from prototype to a real system.

Contact details:

·         Company Supervisor: Albert Jan Colijn -  Mahesh Itraj

·         Company HR Business Partner: Annemieke Moes-Teeuwen 📞 06 55 08 50 81