149 - Studies on Grid Impacts of Distributed Generation in...

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Studies on Grid Impacts of Distributed Generation in a Combined Real-Time Simulation Environment K. Mäki, A. Kulmala, S. Repo, P. Järventausta Abstract—The increasing amount of distributed generation in public networks sets new requirements for the traditional network protection schemes. Actual problems have been experienced relating for instance to fault levels, reclosings and earth faults. As the complex protection is often considered a barrier against more wide-scale use of distributed energy resources, new development is needed. New generation units are often equipped with power electronic converters, whose behavior during faults and disturbances requires accurate modeling. This paper focuses on protection impacts of distributed generation and on the possibility of applying a novel simulation environment for these studies. The environment is described and some motivation for building such system is discussed. An example case is studied using the simulation environment. Some observations are made based on the results. Keywords: distributed generation, protection, RTDS, dSPACE, real-time simulation I. INTRODUCTION HE amount of distributed generation (DG) located at the distribution level of electrical networks is showing rapid growth worldwide. Certain aspects promote this more wide- scale usage, for instance novel energy resources and possibilities of increasing the efficiency of the network. DG has positive impacts on the usage of the electrical network, but it may also result in significant problems. These problems include especially voltage levels and more complicated protection of the network. The power system has traditionally been studied more or less apart from the operation of power electronic blocks. In power system studies, the power electronic components are modeled with simplifications as the focus is on power system behavior. Vice versa, the power electronic studies often model the power system as an ideal source. It can be thought, that the interaction between these sides should be studied more closely. Institutes of Power Electronics and Power Engineering in Tampere University of Technology (TUT), Finland, have recently integrated their real-time simulators to create a novel, combined research environment for more wide- scale studies [1]. In the first phase this environment has been used for studying the grid impacts of DG. K. Mäki, A. Kulmala, S. Repo and P. Järventausta are with Tampere University of Technology, Institute of Power Engineering, Tampere, Finland (e-mail of corresponding author: kari.maki@tut.fi). Presented at the International Conference on Power Systems Transients (IPST’07) in Lyon, France on June 4-7, 2007 II. NETWORK PROTECTION IMPACTS OF DG The distribution network is traditionally designed for a unidirectional flow of power and currents. In other words, the power is assumed to be fed from higher voltage levels and distributed further to lower voltages to the final customers.
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This note was uploaded on 09/28/2010 for the course EPS 090229 taught by Professor Nxhviet during the Winter '10 term at Hanoi University of Technology.

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149 - Studies on Grid Impacts of Distributed Generation in...

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