Impact of InverterConnected Generation Units on the Operations of Power Systems (jointly with Reliability and Risk Engineering) 

Student(en): 
Betreuer: Florian Dörfler, Bala Kameshwar Poolla 
Beschreibung: The introduction of distributed inverterconnected renewable energy units, e.g. wind turbines and photovoltaics, has increased the share of nonsynchronous generation compared to that of classical synchronous generation. This shift in operating conditions has led to a decrease of the inertia in the electric grid pushing its closer to its stability limits [1]. For the Continental European power system, system splitting scenarios have been identified as critical, in particular in view of increased transmission capacities [2]. However, system studies also indicate that inverterconnected generation can contribute to the reduction of system frequency deviations after the occurrence of a contingency. Compared to conventional synchronous machines, inverterconnected generation units feature a shorter time scale of operations enabling the provision of “synthetic inertia” [3][5]. The aim of the project is to further develop already existing frequency control models in order to represent inverterconnected generation units providing “synthetic inertia” [6][7]. In a case study, the obtained model should then be employed to assess the impact of a high penetration of inverterconnected generation units on the frequency stability of the East Australian power system. Possible measures for quantifying the magnitude and consequences of the instability event will be load shedding, binary outcomes (blackout or not), or worstcase frequency and RoCoF. The factors influencing the magnitude of the instability will be investigated and the probability of their occurrence quantified. The information will be used to estimate the risk of instability using the East Australian power system as a case study. Simulations will be carried out in Matlab. The project consists of the following tasks:
[1]. Bergen, A.R. and V. Vittal, Power systems analysis. 2000: Prentice Hall. [2]. Frequency Stability Evaluation Criteria for the Synchronous Zone of Continental Europe  Requirements and impacting factors  RGCE System Protection & Dynamics Sub Group March 2016. [3]. B. Kroposki et al., "Achieving a 100% Renewable Grid: Operating Electric Power Systems with Extremely High Levels of Variable Renewable Energy," in IEEE Power and Energy Magazine, vol. 15, no. 2, pp. 6173, MarchApril 2017. [4]. Pieter Tielens and Dirk Van Hertem, The relevance of inertia in power systems, Renewable and Sustainable Energy Reviews, Volume 55, March 2016, Pages 999–1009. [5]. W. Winter, K. Elkington, G. Bareux and J. Kostevc, "Pushing the Limits: Europe's New Grid: Innovative Tools to Combat Transmission Bottlenecks and Reduced Inertia," in IEEE Power and Energy Magazine, vol. 13, no. 1, pp. 6074, Jan.Feb. 2015. [6]. Hatziargyriou, N. "Microgrids: Architectures and Control, Hoboken." (2014) [7]. Zhong, QingChang, and Tomas Hornik. Control of power inverters in renewable energy and smart grid integration. Vol. 97. John Wiley & Sons, 2012. Weitere Informationen 
Professor: Florian Dörfler 
Projektcharakteristik: Typ: Art der Arbeit: Voraussetzungen:  
Anzahl StudentInnen: Status: open  
Projektstart: Semester: 