Location

This example model can be found in the software under the category "Distribution and Industrial Power Systems" > "Feeder_25kV_24Bus.ecf".

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Description

The model consists of a distribution network exploited in a radial topology for various applications such as:

• Testing of breaker-recloser

• Impact of big load, including large induction motor setup

• Impact of capacitor switching

• Effect of load unbalance

• Harmonics of typical industrial loads

• Harmonic resonance

• Impact of loads on voltage flicker

• Effect of load modeling

This power network has an an average load of 5000 kW, 800 kVAR. The total length of lines is about 36 kmfor an average lenght of main lines about 5.5 km except for the remote load separated from the rest of the network by 46 km. It contains balanced and unbalanced loads, two induction motors, two capacitor banks, 3 breaker-reclosers, a 100 kW load with caracteristic harmonic of DC-motor drive (6-pulses). Loads are modelled as "Voltage dependant". The typical exponential for voltage dependence for winter load (electric heating) is np = 1.7 and nq = 2.6 (see ref.).

Simulation and Results

In this example model, a fault is programmed at L4 on phase A of the 3-phase bus from t = 0.1s to t = 0.2s. The following figures are displaying the behaviour of current and voltage at begining of the feeder, at 11 km from the utility, at 24 km from the utility and at the remote load.

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The following figures display the current at the different motors in the network and also the machine speed for the two induction motors.

Reference

Load Representation for Dynamic Performance Analysis.
IEEE Task Force on Load Representation for Dynamic Performance
IEEE Trans. on Power Systems, Vol.8, No.2 , May 1993.