# course: Calculation of Electric Power Distributions Networks

number:
141080
teaching methods:
lecture with tutorials
media:
overhead transparencies, computer based presentation, black board and chalk
responsible person:
Prof. Dr.-Ing. Constantinos Sourkounis
lecturer:
Prof. Dr.-Ing. Walter Brandes (extern)
language:
german
HWS:
3
CP:
4
offered in:
winter term

• start:

## Exam

##### Die Angaben zu den Prüfungsmodalitäten (im WiSe 2020/2021 | SoSe 2021) erfolgen vorbehaltlich der aktuellen Situation. Notwendige Änderungen aufgrund universitärer Vorgaben werden zeitnah bekanntgegeben.

Date according to prior agreement with lecturer.

 Form of exam: oral Registration for exam: FlexNow Duration: 30min

## goals

The students obtain information about the structure of transmission and distribution grids and the associated grid calculation methods. They feel certain applying mesh models and mathematical transformations to prepare a mesh calculation. The students receive knowledge of primary and secondary control in the interconnected network and their impact on grid performance and frequency. They will be able to independently determine parameters of multi-conductor systems, transformers and generators and perform a load-flow and short-circuit calculation for small network sections. Important methods for the quick estimation of the short-circuit power of the grid at a connection point will be mastered.

## content

The lecture explains grid structures and voltage levels of energy transmission and distribution grids. The range extends from the European interconnected grid as a large energy transmission network down to small grid structures in districts or larger industrial enterprises. Requirements regarding the supply quality in these networks are communicated. Based on networks and network requirements, the tasks and scope of grid calculations are presented, analog and mathematical grid models are presented and the characteristics of one- and three-phase grid simulation are presented. Important mathematical tools, especially the transformation of voltages and currents into symmetrical components, are introduced - supported by application examples. The lecture outlines power and frequency control in the network and explains the principles of the primary and secondary control behavior. The characteristics of multi-conductor systems, in particular capacitance and inductance linings of high-voltage cables, which are necessary for the network calculation, are determined taking into account the bundled conductors and ground return. Substitute circuits for transformers and generators are introduced and parameterized. With these information, a load flow and short-circuit calculation in a grid is feasible, as will be made clear towards the end of the lecture.

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## recommended knowledge

• Calculation method for multi-conductor systems in sinusoidal form
• Basic knowledge about electrical machines

Such prior knowledge is usually taught in lectures such as 'Fundamentals of Electrical Engineering' and 'Fundamentals of Electrical Engineering III-Power Engineering'.