On-load voltage regulation in the low voltage grid

In the electrical distribution grids the complexity of power flow increases due to increasing penetration with small and distributed power generation plants. In the future distribution system operators (DSOs) are requested to build up an efficient and up to date grid infrastructure by integrating th...

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Bibliographic Details
Published in:	CIRED 2012 Workshop: Integration of Renewables into the Distribution Grid p. 85
Main Authors:	Schmid, R, Walz, R.-D, Boldt, K, Mu¨ller, H, Handt, K, Hipszki, G
Format:	Conference Proceeding
Language:	English
Published:	Stevenage, UK IET 2012 The Institution of Engineering & Technology
Subjects:	Control of electric power systems Distributed power generation Distribution networks Power system control Transformers and reactors Voltage control power distribution control back feeding power voltage fluctuation power transformers on-load voltage regulation power flow low voltage grid electrical distribution grids regulated distribution transformer distributed power generation power grids voltage control
Online Access:	Get full text
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Summary:	In the electrical distribution grids the complexity of power flow increases due to increasing penetration with small and distributed power generation plants. In the future distribution system operators (DSOs) are requested to build up an efficient and up to date grid infrastructure by integrating the end consumers with their fluctuating power generation, their load and their storage capabilities in the system. In most European countries government subventions and the obligation to connect small solar and bio mass power generation lead to necessary extensions and strengthening of the LV grids. Depending on the generation and load scenarios in the LV and MV grids, a fluctuation of the power flow is expected, which can even result in back-feeding power into the MV and HV grid. This causes large voltage fluctuation in the grid. One possibility to remain compliant with the reduced voltage range of +/-10% according EN 50160 in grids with a high share of distributed generation is the use of a regulated distribution transformer. Especially in the case of homogeneous grids this measure is promising. Thereby the challenge is the development of an on-load voltage regulation for distribution transformers by keeping the accustomed performance and dimensions to ensure the changeability und comprehensive operation wherever it's needed. Siemens AG has developed a regulated distribution transformer with an on-load voltage regulation on the low voltage side which fulfills all these requirements. Together with the German DSO E.ON Mitte AG a functional model was installed and field tested in an existing grid. (4 pages)
ISBN:	1849196281 9781849196284
DOI:	10.1049/cp.2012.0745