Rajat Majumder

Voltage Sources Converter (VSC) based HVDC is gaining momentum towards a potential multi terminal HVDC grid (MTDC). However there are some unique control challenges in control and protection before a MTDC grid could be made operational. One of them is following a converter outage in a MTDC grid, it is critical that the healthy converter stations share the power mismatch/burden in a desirable way. A fixed value of power-voltage droop in the DC link voltage control loops can ensure proper distribution according to the converter ratings. Here a scheme for adapting the droop coefficients to share the burden according to the available headroom of each converter station is proposed. Advantage of this adaptive (variable) droop scheme for autonomous power sharing is established through transient simulations on an MTDC grid with four bipolar converters and DC cable network with metallic return. Results for both rectifier and inverter outages under two different scenarios are presented. Post-contingency steady-state operating points obtained from transient simulation are shown to be consistent with those derived analytically. Impact of varying droop coefficients on the stability of the MTDC grid is established. An averaged model in Matlab/SIMULINK which has been validated against detailed switched model in EMTDC/PSCAD is used for the stability and modal analysis.

Biography:

Dr. Majumder manages and leads system stability team at Power System Engineering Services (PSES) Group in Mitsubishi Electric Power product Inc. (MEPPI). Provide leadership and technical direction to grow the existing business and add new business areas. Dr. Majumder was with Siemens Industry, Digital Grid Business Unit (2011- 2016) as a specialist Planning Consultant focusing of HVDC, FACTS and Wind Integration projects in the US. He was the primary technical interface with the lead design center in Germany and was involved in the very early stages of project development, working toward obtaining the interconnection service agreement for large HVDC/FACTS projects. In this role he had worked closely with various system operators and utility companies ensuring a satisfactory outcome of feasibility and system impact studies. Before joining Siemens, Dr. Majumder worked in ABB’s Corporate Research Center in both Sweden and the US (2007 – 2011). He has led a number of very highly sensitive intellectual property R&D projects, with extremely successful outcomes. Some of his inventions have already been commercialized within ABB’s FACTS product line. He has also worked as a lecturer in Power and Energy Systems at University of Queensland, Brisbane, Australia between 2006 – 2007.

Address:Pittsburgh, United States

Rajat Majumder

Biography:

Address:Pittsburgh, United States