Connectivity

Author

Robbert Hardin (Alliander)

Version

v0.1 concept

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Issue on GitHub (Netbeheer-Nederland/doc-modeling-guidelines)

Introduction

This document is part of the grid modelling approach and details the grid model data requirements for data supplied by Dutch transmission and distribution system operators and describes in detail the following terms; ConductingEquipment, ConnectivityNode, Terminal, TopoolodicalNode.

Connectivity in words

An AC power system consistss of conducting equipment designed to carry current. They are connected through terminals who are connected to a conducting equipment object by its connectivity node:

(CE) --has-- (CN) --connectable by-- (T).

A connectivty node is also the way to connect two conducting equipment objects by their terminals:

(CE_1)--(CN_1)--(T_1) --connects to connecting connectivity node--(CN)--connects to terminal of conducting equipement-- (T_2)--(CN_2)--(CE_2)

Connectivity in diagrams

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Connectivy by definition

ConductingEquipment

The parts of the AC power system that are designed to carry current or that are conductively connected through terminals.

ConductingEquipment

ConectivityNode

Connectivity nodes are points where terminals of AC conducting equipment are connected together with zero impedance.

ConnectivityNode

Terminal

An AC electrical connection point to a piece of conducting equipment. Terminals are connected at physical connection points called connectivity nodes.

Terminal

TopologicalNode

For a detailed substation model a topological node is a set of connectivity nodes that, in the current network state, are connected together through any type of closed switches, including jumpers. Topological nodes change as the current network state changes (i.e., switches, breakers, etc. change state). For a planning model, switch statuses are not used to form topological nodes. Instead they are manually created or deleted in a model builder tool. Topological nodes maintained this way are also called "busses".

TopologicalNode

Connectivity in use

When you connect several conducting equipment objects there into a string, there are two possibilities:

  1. There is no energy consumption.
    In this case you can simplify your model and your grid calculations by replacing this string of conducting equipment objects by a topological node. This will change your model from a connectivity (node-breaker )model into a toplogical (bus-branch) model.

  2. There is energy consumption.
    In this case you can add metering devices to your terminal to measure the energy consumption and bill the energy consumer.

This document includes text from the LTDS Grid Modelling Guidelines, published under the Open Government License