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Author
Name Rivera Rodriguez, Sergio Raul
Research field Mechanical Engineering
Career stage professor
Home university/institution National University of Colombia
Department/Research unit at home university/institution -
Chair/Working group at home institution -

International activity
Country Germany
Location Bochum
University Ruhr-Universität Bochum (RUB)
Fund Research School VIP
Type of activity research stay
Period starts 01-01-2016
ends 31-12-2018
Keywords -
Report Multilevel Control for Microgrids Dispatch Considering Stability Issues through MPC-based Frequecy Regulation

Future power systems will be an aggregation of multiple microgrids; it implies a total rethink of some aspects of its operation. Microgrids are small power system networks with high penetration of renewable energy sources and energy storage systems, these networks are able to handle controllable and non-contrable loads and must be robust to different disturbances. Additionally, they can work islanded or connected to the main power network. In this way, the power engineers will need coordination and control tools in order to handle power systems with multiple microgrids. The main objective of this project is to develop a simulation tool that considers two issues in the operation of microgrids. The first issue is the power economic dispatch and the second is the frequency regulation. Normally, these two issues have been considered decoupled causing problems with the stability and robustness of the system. This proposal aims to combine both aspects considering a two level control. The first level will be in charge of the power setting of each element in the system, given by the solution of the optimization problem contemplating in the formulation two additional aspects in regards to the traditional economic dispatch. The first additional aspect is the stochastic behavior of the renewable energy sources and the second one is the stability constraints through combining bifurcation theory and nonlinear optimization (normal vector constraints for stability and robustness). The second level will be in charge of the frequency regulation using model predictive control techniques and considering the inertia mimicking in the renewable energy sources and the energy storage systems. This would provide a completely new tool for investigation the operation of multiple microgrids in a power system (Fig. 1).
Fig. 1. Multiple Microgrids in a Power System (Figure from a previous work called: S. Rivera, A. Farid, K. Youcef-Toumi, Book Chapter: “An Intelligent Multi-Agent Based Architecture for Resilient Self-Healing Operation of Multiple Microgrids”, Book on Industrial Agents: Emerging Applications of Software Agents in Industry, Elsevier 2015, Print Book ISBN: 9780128003411.

Visit in 2015

Mr. Rivera Rodriguez's visit took place from 28.09.-09.10.2015. During his visit, Mr. Rivera interacted intensively with my doctoral student Yannik Löhr, who is writing his doctoral thesis on domestic energy supply networks. This topic is thematically closest to the field of work. After his visit here, Mr. Rivera wrote a book chapter on microgrids, for which he offered me a co-authorship, which I did not consider justifiable because I was not involved enough and therefore rejected for scientific reasons.

Although an intensive cooperation with Mr. Rivera did not come off, his visit had a great value in my opinion, because my doctoral students became aware that international cooperation is very interesting and very beneficial for their own work. After Mr. Rivera's visit, it was much easier for me to recruit PhD students to work with international partners and some of my staff members expressed and contributed their own initiative in applying for such projects. In the meantime, we have succeeded in acquiring an AvH-funded institute partnership with the Technical University in Bratislava, which is not directly related to Mr. Rivera, but was indirectly driven by this as described above.

At the same time, we are also endeavouring to cooperate with UFABC in Brazil, which has not yet been funded due to a lack of matching of DFG calls for proposals.
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