Paper_384 - CIRED 18th International Conference on...

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C I R E D 18 th International Conference on Electricity Distribution Turin, 6-9 June 2005 CIRED2005 Session No 5 DISTRIBUTION NETWORK MODELS FOR STUDYING THE EFFECTS OF DISTRIBUTED GENERATION Henry LAGLAND, Kimmo KAUHANIEMI University of Vaasa - Finland, INTRODUCTION In this paper a collection of distribution network models is introduced. These simulation models are especially developed in order to enable detailed studies of future distribution sys- tems where there is a relatively large amount of distributed generation (DG). By using computer simulations the effects of DG can be analysed before any installations. Also, with accu- rate simulation models the performance of existing and new apparatus and technical solutions in distribution networks can be trustworthy examined in advance with moderate costs. OBJECTIVES AND METHODS OF THE STUDY Electricity market liberalisation increases competition and the need to utilize distribution networks more efficiently. The in- crease of distributed generation transforms passive networks to active networks. However, the practices relating to the network are well established and considerable financial benefits would be needed if these practices are going to be changed. In order to develop DG and related solutions for global markets their suit- ability for local distribution networks must be verified. One way to do this is to apply simulation models tuned to represent dis- tribution networks in various countries. This paper presents results from a study where the main aim has been to develop such models. The study is a part of a larger research project where both the University of Vaasa and VTT Technical Re- search Centre of Finland are participating. In this paper the focus is especially on medium voltage (MV) networks. MV distribution network structures differ locally and from country to country. In order to develop an internationally covering set of distribution network models, an international questionnaire on MV network structures, applied techniques and methods in different countries has been performed. Nine countries from different continents responded to the question- naire. The structure of MV rural and urban networks in different countries including the feeding network, the primary substation, grounding arrangements, network configuration, protection and distributed generation was reviewed. An extensive literature search was also made about the topic. Based on the fundamental characteristics of the network, this paper presents and defines a set of generic medium voltage network models. At first the typical parameters of medium voltage distribution network and their typical values in different countries are presented. After that the key parameters of the defined set of network models are reviewed. At the end of the paper the basic principles applied in the modelling and an ex- ample network with some simulation results are introduced. TYPICAL PARAMETERS OF MV NETWORKS
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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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Paper_384 - CIRED 18th International Conference on...

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